diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 5fbfac0..9d72813 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -93,12 +93,18 @@ jobs:
         uses: actions/setup-java@v5
         with:
           distribution: temurin
-          java-version: ${{ matrix.java }}
+          java-version: '21'
           cache: maven
 
       - name: Build plugin JAR
         run: mvn -B -ntp -DskipTests package
 
+      - name: Switch to runtime JDK ${{ matrix.java }}
+        uses: actions/setup-java@v5
+        with:
+          distribution: temurin
+          java-version: ${{ matrix.java }}
+
       - name: Resolve latest ${{ matrix.platform }} build for MC ${{ matrix.mc-prefix }}.x
         id: server
         run: |
@@ -214,7 +220,7 @@ jobs:
         uses: actions/setup-java@v5
         with:
           distribution: temurin
-          java-version: ${{ matrix.java }}
+          java-version: '21'
           cache: maven
 
       - name: Configure Git for BuildTools
@@ -225,6 +231,12 @@ jobs:
       - name: Build plugin JAR
         run: mvn -B -ntp -DskipTests package
 
+      - name: Switch to runtime JDK ${{ matrix.java }}
+        uses: actions/setup-java@v5
+        with:
+          distribution: temurin
+          java-version: ${{ matrix.java }}
+
       - name: Restore cached Spigot JAR (MC ${{ matrix.mc-prefix }}, Java ${{ matrix.java }})
         id: spigot-cache
         uses: actions/cache@v5
diff --git a/CHANGELOG.md b/CHANGELOG.md
index e0adde7..d9c814c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,6 +12,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Added
 
 - **Placeholder formatted output regression tests** - added unit coverage in `EzCountdownPlaceholderExpansionUnitTest` to verify `%ezcountdown_<name>_formatted%` honors `display.time-format.hide-leading-zeros` for both enabled and disabled configurations.
+- **Optional countdown start/end sounds** - countdowns can now define `sounds.start` and `sounds.end` with Bukkit `Sound` enum names in `countdowns.yml`.
+- **GUI sound editors** - the in-game editor now includes dedicated actions to configure and validate start/end sounds, including `none` to disable either sound.
+
+### Changed
+
+- **Runtime start/end flow** - when a configured start/end sound is valid, EzCountdown now plays it to online players at countdown start/end alongside existing message, teleport, firework, and command actions.
 
 ## [2.0.1] - 2026-05-22
 
diff --git a/README.md b/README.md
index 65415c8..d83a161 100644
--- a/README.md
+++ b/README.md
@@ -6,9 +6,11 @@ EzCountdown provides configurable countdown timers for events, launches, and mai
 ## Features
 - Fixed date, duration, recurring, and manual countdown modes.
 - Display options: action bar, boss bar (1.9+), chat, title, and scoreboard.
+- Optional start/end sounds per countdown (`sounds.start`, `sounds.end`) using Bukkit `Sound` names.
 - PlaceholderAPI support for `%ezcountdown_<name>_days%`, `_hours`, `_minutes`, `_seconds`, and `_formatted`.
 - Customizable messages (messages.yml), permissions, and update intervals.
 - Run console commands when countdowns finish.
+- GUI editor support for start/end messages, display modes, end commands, and start/end sounds.
 - **Developer API**: send ephemeral one-shot notifications from your plugin without touching YAML (see [API overview](docs/api/README.md)).
 
 ## Commands
diff --git a/docs/api/README.md b/docs/api/README.md
index 23ef9a5..216089a 100644
--- a/docs/api/README.md
+++ b/docs/api/README.md
@@ -89,6 +89,8 @@ Countdown countdown = CountdownBuilder.builder("launch")
     .formatMessage("countdown.format")
     .startMessage("Server Launching")
     .endMessage("Server Launched")
+    .startSound("ENTITY_PLAYER_LEVELUP")
+    .endSound("BLOCK_NOTE_BLOCK_PLING")
     .zoneId(ZoneId.systemDefault())
     .duration(Duration.ofMinutes(10))
     .build();
diff --git a/docs/api/model/Countdown.md b/docs/api/model/Countdown.md
index 052468e..a967a1d 100644
--- a/docs/api/model/Countdown.md
+++ b/docs/api/model/Countdown.md
@@ -26,6 +26,8 @@ Important accessors and behavior:
  - `String getFormatMessage()` - format string used for display messages.
  - `String getStartMessage()` - message broadcasted on start (if configured).
  - `String getEndMessage()` - message broadcasted on end (if configured).
+ - `String getStartSound()` / `void setStartSound(String)` - optional Bukkit `Sound` enum name for start.
+ - `String getEndSound()` / `void setEndSound(String)` - optional Bukkit `Sound` enum name for end.
  - `List<String> getEndCommands()` - commands executed when countdown ends.
  - `ZoneId getZoneId()` - timezone used when resolving fixed/recurring dates.
 
@@ -39,3 +41,5 @@ Runtime fields (mutable):
 Notes
 
 - The constructor establishes the immutable configuration; runtime fields are updated by the plugin when starting/stopping the countdown.
+- `startSound` / `endSound` are optional mutable fields. Passing `null` or blank disables that phase sound.
+- YAML-backed countdowns map these fields to `sounds.start` and `sounds.end`.
diff --git a/docs/configuration.md b/docs/configuration.md
index 89f9a18..3a33df8 100644
--- a/docs/configuration.md
+++ b/docs/configuration.md
@@ -63,6 +63,52 @@ Set per-countdown inside `countdowns.yml` under `display.bossbar`:
 
 ---
 
+## Start/end sounds
+
+Set optional per-countdown sounds in `countdowns.yml`:
+
+| Key | Type | Default | Description |
+|---|---|---|---|
+| `sounds.start` | string | not set | Bukkit `Sound` enum name played when the countdown starts |
+| `sounds.end` | string | not set | Bukkit `Sound` enum name played when the countdown ends |
+
+Notes:
+
+- Sound names must match Bukkit `Sound` enum values (for example `ENTITY_PLAYER_LEVELUP`).
+- If a sound key is missing or blank, no sound is played for that phase.
+- If an invalid sound is configured, EzCountdown logs a warning and continues other start/end actions.
+- The GUI sound editor now prints the full list of sounds available on your running server version.
+
+Common choices:
+
+- `ENTITY_PLAYER_LEVELUP` - positive "start" cue.
+- `BLOCK_NOTE_BLOCK_PLING` - short neutral confirmation.
+- `ENTITY_EXPERIENCE_ORB_PICKUP` - subtle reward-like ping.
+- `UI_BUTTON_CLICK` - lightweight interface-style sound.
+- `BLOCK_BELL_USE` - event bell/chime.
+- `ENTITY_FIREWORK_ROCKET_BLAST` - celebratory end sound.
+- `BLOCK_RESPAWN_ANCHOR_CHARGE` - energetic build-up tone.
+- `ENTITY_ENDER_DRAGON_GROWL` - dramatic finale.
+
+Full references:
+
+- Spigot `Sound` enum: https://hub.spigotmc.org/javadocs/spigot/org/bukkit/Sound.html
+- Paper `Sound` enum: https://jd.papermc.io/paper/1.21/org/bukkit/Sound.html
+
+Example:
+
+```yaml
+countdowns:
+  arena_event:
+    type: DURATION
+    duration: "15m"
+    sounds:
+      start: "ENTITY_PLAYER_LEVELUP"
+      end: "BLOCK_NOTE_BLOCK_PLING"
+```
+
+---
+
 ## Clock-aligned recurring options
 
 Set these per-countdown in `countdowns.yml`:
@@ -118,6 +164,9 @@ countdowns:
       format: "New Year in {formatted}"
       start: "Countdown started!"
       end: "Happy New Year!"
+    sounds:
+      start: "ENTITY_PLAYER_LEVELUP"
+      end: "BLOCK_NOTE_BLOCK_PLING"
     commands_on_end:
       - "broadcast &6Happy New Year!"
     teleport:
diff --git a/docs/feature/gui.md b/docs/feature/gui.md
index 930286d..548b0bb 100644
--- a/docs/feature/gui.md
+++ b/docs/feature/gui.md
@@ -17,6 +17,7 @@ Opening the GUI
  - `Main` - see a list of configured countdowns, their running state, and quick start/stop/delete actions.
  - `Display Editor` - pick which `display.types` will show for a countdown and edit per-display settings. For the `BOSS_BAR` display the editor also exposes `color` and `style` options so you can match event themes or improve visibility; the GUI validates input and will show an error if an invalid option is selected.
  - `Messages` - edit `messages.format`, `messages.start`, and `messages.end` templates with live preview.
+ - `Sounds` - edit `sounds.start` and `sounds.end` using Bukkit `Sound` enum names. The editor validates values, supports `none` to disable either sound, and prints the full list of available sounds from your current server version before input.
  - `Commands Editor` - add, remove, or reorder `commands.end` to run console commands when a countdown completes.
 
 Behaviour & saving
diff --git a/docs/index.md b/docs/index.md
index 52ccaaa..a5c1804 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -21,6 +21,7 @@ A feature-rich countdown plugin for Paper/Spigot servers. Create countdowns for
 - **Discord webhooks**  -  post start/end notifications to a Discord channel.
 - **In-game GUI**  -  manage countdowns visually without editing YAML.
 - **Firework shows**  -  trigger configurable firework displays on start or end.
+- **Start/end sounds**  -  optionally play configurable Bukkit sounds when countdowns start or finish.
 - **Teleport actions**  -  move all online players to a named location when a countdown starts or ends.
 - **Console commands on end**  -  run any command when a countdown completes.
 - **Developer API**  -  create, start, stop, listen to countdown events, and send per-player notifications from other plugins.
diff --git a/docs/topics/bbcode-topic.txt b/docs/topics/bbcode-topic.txt
index 18af91d..18950ea 100644
--- a/docs/topics/bbcode-topic.txt
+++ b/docs/topics/bbcode-topic.txt
@@ -1,6 +1,6 @@
 [CENTER][SIZE=6][B]EzCountdown[/B][/SIZE]
 [SIZE=3]Run flash sales, timed events, and launches with stunning countdowns - ActionBar, BossBar, Titles & Placeholders![/SIZE]
-[SIZE=2]Spigot, Paper, or Bukkit 1.7-1.21.* • Action bar, boss bar, title, chat, scoreboard • PlaceholderAPI ready[/SIZE][/CENTER]
+[SIZE=2]Paper/Spigot 1.18+ • Java 17+ • Action bar, boss bar, title, chat, scoreboard • PlaceholderAPI ready[/SIZE][/CENTER]
 
 Found an issue or have a question? Please contact me through [URL='https://discord.gg/yWP95XfmBS']the EzPlugins Discord server[/URL].
 
@@ -9,10 +9,12 @@ Found an issue or have a question? Please contact me through [URL='https://disco
 [*][B]Perfect for flash sales & events[/B] - Instantly set up countdowns for shop discounts, launches, or any special event.
 [*][B]Multiple countdown types[/B] - Fixed dates, durations, recurring schedules, or manual timers. Great for launches, resets, or surprise sales.
 [*][B]Flexible displays[/B] - Show timers in action bar, boss bar, title, chat, or scoreboard. Make sure every player sees the excitement.
+[*][B]Start/end sounds[/B] - Configure optional [icode]sounds.start[/icode] and [icode]sounds.end[/icode] per countdown using Bukkit sound names.
 [*][B]Firework shows[/B] - Optional, configurable firework displays for celebration moments. ([COLOR=#ff0000]new[/COLOR])
 [*][B]Permission control[/B] - Limit visibility or management to specific ranks. Keep control in the hands of your staff or VIPs.
 [*][B]PlaceholderAPI support[/B] - Use %ezcountdown_<name>_formatted% and time-part placeholders in any plugin or message.
 [*][B]Config-driven[/B] - Tune update intervals, messaging, and defaults in YAML. No coding required, just edit and reload.
+[*][B]GUI sound editor[/B] - Set or disable countdown sounds directly in the editor with input validation.
 [*][B]Translation variables[/B] - Centralize message text in `messages.yml` and reference keys from `countdowns.yml` using `{translate:key.path}` so owners can reset countdowns without losing localized text.
 [/LIST]
 
diff --git a/docs/topics/markdown-topic.md b/docs/topics/markdown-topic.md
index 09f2ca6..93f9c1f 100644
--- a/docs/topics/markdown-topic.md
+++ b/docs/topics/markdown-topic.md
@@ -2,7 +2,7 @@
 
 **EzCountdown** is the ultimate custom countdown timer plugin for Minecraft servers. Whether you’re launching a new map, running a flash sale, or celebrating a special event, EzCountdown lets you create, manage, and display any countdown you want, your way.
 
-**Compatible with Spigot, Paper, and Bukkit 1.7–1.21 · Java 8+ · Action bar, boss bar, title, chat & scoreboard displays · PlaceholderAPI ready**
+**Compatible with Paper/Spigot 1.18+ · Java 17+ · Action bar, boss bar, title, chat & scoreboard displays · PlaceholderAPI ready**
 
 ---
 
@@ -10,8 +10,9 @@
 
 - **Create any countdown** – Set up timers for launches, events, sales, or anything you can imagine. Fixed dates, durations, recurring, or manual, your choice.
 - **Flexible displays** – Show countdowns in the action bar, boss bar, title, chat, or scoreboard. Make your timers visible everywhere players look.
+- **Start/end sounds** – Configure optional `sounds.start` and `sounds.end` per countdown using Bukkit sound names.
  - **Easy configuration** – Define countdowns in YAML, customize messages, and reload instantly - no coding required.
- - **Easy configuration** – Define countdowns in YAML, customize messages, and reload instantly - no coding required.
+ - **GUI sound editor** – Set or disable start/end sounds directly from the in-game editor with validation.
  - **Translation variables** – You can keep message text in `messages.yml` and reference it from `countdowns.yml` with the `{translate:key.path}` token. This lets you centralize translations and makes resetting `countdowns.yml` safe because messages are pulled from `messages.yml` at runtime.
 - **Permission control** – Limit who can see or manage each countdown.
 - **PlaceholderAPI support** – Use countdown placeholders in any plugin or message.
diff --git a/src/main/java/com/skyblockexp/ezcountdown/api/model/Countdown.java b/src/main/java/com/skyblockexp/ezcountdown/api/model/Countdown.java
index 2792050..4f2b83d 100644
--- a/src/main/java/com/skyblockexp/ezcountdown/api/model/Countdown.java
+++ b/src/main/java/com/skyblockexp/ezcountdown/api/model/Countdown.java
@@ -51,6 +51,12 @@ public final class Countdown {
     /** Message template shown when the countdown ends. */
     private final String endMessage;
 
+    /** Optional Bukkit sound name to play when the countdown starts. */
+    private String startSound;
+
+    /** Optional Bukkit sound name to play when the countdown ends. */
+    private String endSound;
+
     /** Console commands to execute when the countdown completes. */
     private final java.util.List<String> endCommands;
 
@@ -129,6 +135,8 @@ public Countdown(String name,
         this.formatMessage = formatMessage;
         this.startMessage = startMessage;
         this.endMessage = endMessage;
+        this.startSound = null;
+        this.endSound = null;
         this.endCommands = endCommands == null ? java.util.List.of() : java.util.List.copyOf(endCommands);
         this.zoneId = zoneId;
         this.alignToClock = false;
@@ -188,6 +196,8 @@ public Countdown(String name,
         this.formatMessage = formatMessage;
         this.startMessage = startMessage;
         this.endMessage = endMessage;
+        this.startSound = null;
+        this.endSound = null;
         this.endCommands = endCommands == null ? java.util.List.of() : java.util.List.copyOf(endCommands);
         this.zoneId = zoneId;
         this.autoRestart = autoRestart;
@@ -229,6 +239,8 @@ public Countdown(String name,
         this.formatMessage = formatMessage;
         this.startMessage = startMessage;
         this.endMessage = endMessage;
+        this.startSound = null;
+        this.endSound = null;
         this.endCommands = endCommands == null ? java.util.List.of() : java.util.List.copyOf(endCommands);
         this.zoneId = zoneId;
         this.autoRestart = autoRestart;
@@ -267,6 +279,22 @@ public Countdown(String name,
     /** @return end message template */
     public String getEndMessage() { return endMessage; }
 
+    /** @return optional sound name to play on start, or null when disabled */
+    public String getStartSound() { return startSound; }
+
+    /** Set optional start sound name; null/blank disables start sound. */
+    public void setStartSound(String startSound) {
+        this.startSound = (startSound == null || startSound.isBlank()) ? null : startSound;
+    }
+
+    /** @return optional sound name to play on end, or null when disabled */
+    public String getEndSound() { return endSound; }
+
+    /** Set optional end sound name; null/blank disables end sound. */
+    public void setEndSound(String endSound) {
+        this.endSound = (endSound == null || endSound.isBlank()) ? null : endSound;
+    }
+
     /** @return immutable copy of end commands */
     public java.util.List<String> getEndCommands() { return java.util.List.copyOf(endCommands); }
 
diff --git a/src/main/java/com/skyblockexp/ezcountdown/api/model/CountdownBuilder.java b/src/main/java/com/skyblockexp/ezcountdown/api/model/CountdownBuilder.java
index 4c4f601..9b9d156 100644
--- a/src/main/java/com/skyblockexp/ezcountdown/api/model/CountdownBuilder.java
+++ b/src/main/java/com/skyblockexp/ezcountdown/api/model/CountdownBuilder.java
@@ -28,6 +28,8 @@ public final class CountdownBuilder {
     private String formatMessage = null;
     private String startMessage = null;
     private String endMessage = null;
+    private String startSound = null;
+    private String endSound = null;
     private List<String> endCommands = List.of();
     private ZoneId zoneId = ZoneId.systemDefault();
     private boolean autoRestart = false;
@@ -99,6 +101,16 @@ public CountdownBuilder endMessage(String msg) {
         return this;
     }
 
+    public CountdownBuilder startSound(String sound) {
+        this.startSound = sound;
+        return this;
+    }
+
+    public CountdownBuilder endSound(String sound) {
+        this.endSound = sound;
+        return this;
+    }
+
     public CountdownBuilder endCommands(List<String> commands) {
         this.endCommands = commands == null ? List.of() : List.copyOf(commands);
         return this;
@@ -188,6 +200,8 @@ public Countdown build() {
         if (recurringMonth > 0) countdown.setRecurringMonth(recurringMonth);
         if (recurringDay > 0) countdown.setRecurringDay(recurringDay);
         if (recurringTime != null) countdown.setRecurringTime(recurringTime);
+        countdown.setStartSound(startSound);
+        countdown.setEndSound(endSound);
         if (ephemeral) countdown.setEphemeral(true);
         if (targetPlayers != null) countdown.setTargetPlayers(targetPlayers);
 
diff --git a/src/main/java/com/skyblockexp/ezcountdown/gui/EditorMenu.java b/src/main/java/com/skyblockexp/ezcountdown/gui/EditorMenu.java
index b808031..16be27b 100644
--- a/src/main/java/com/skyblockexp/ezcountdown/gui/EditorMenu.java
+++ b/src/main/java/com/skyblockexp/ezcountdown/gui/EditorMenu.java
@@ -38,7 +38,7 @@ public EditorMenu(CountdownManager manager, ChatInputListener chatInputListener,
 
     public void openEditor(Player player, Countdown countdown) {
         String title = PREFIX + countdown.getName();
-        Inventory inv = Bukkit.createInventory(null, 9, title);
+        Inventory inv = Bukkit.createInventory(null, 18, title);
         ItemStack run = new ItemStack(countdown.isRunning() ? MaterialCompat.resolve("LIME_CONCRETE", "LIME_WOOL", "WOOL") : MaterialCompat.resolve("RED_CONCRETE", "RED_WOOL", "WOOL"));
         ItemMeta rm = run.getItemMeta();
         rm.setDisplayName((countdown.isRunning() ? ChatColor.GREEN : ChatColor.RED) + "Toggle Running");
@@ -107,6 +107,30 @@ public void openEditor(Player player, Countdown countdown) {
         end.setItemMeta(em);
         inv.setItem(8, end);
 
+        ItemStack startSound = new ItemStack(Material.NOTE_BLOCK);
+        ItemMeta ssm = startSound.getItemMeta();
+        ssm.setDisplayName(ChatColor.AQUA + "Edit Start Sound");
+        String startSoundName = countdown.getStartSound() == null ? "(none)" : countdown.getStartSound();
+        ssm.setLore(List.of(
+            ChatColor.GRAY + "Current: " + startSoundName,
+            ChatColor.DARK_GRAY + "Type a Bukkit Sound enum name",
+            ChatColor.DARK_GRAY + "Type 'none' to disable"
+        ));
+        startSound.setItemMeta(ssm);
+        inv.setItem(9, startSound);
+
+        ItemStack endSound = new ItemStack(MaterialCompat.resolve("JUKEBOX", "NOTE_BLOCK"));
+        ItemMeta esm = endSound.getItemMeta();
+        esm.setDisplayName(ChatColor.RED + "Edit End Sound");
+        String endSoundName = countdown.getEndSound() == null ? "(none)" : countdown.getEndSound();
+        esm.setLore(List.of(
+            ChatColor.GRAY + "Current: " + endSoundName,
+            ChatColor.DARK_GRAY + "Type a Bukkit Sound enum name",
+            ChatColor.DARK_GRAY + "Type 'none' to disable"
+        ));
+        endSound.setItemMeta(esm);
+        inv.setItem(10, endSound);
+
         player.openInventory(inv);
     }
 
diff --git a/src/main/java/com/skyblockexp/ezcountdown/listener/actions/EditEndSoundAction.java b/src/main/java/com/skyblockexp/ezcountdown/listener/actions/EditEndSoundAction.java
new file mode 100644
index 0000000..2dd7779
--- /dev/null
+++ b/src/main/java/com/skyblockexp/ezcountdown/listener/actions/EditEndSoundAction.java
@@ -0,0 +1,55 @@
+package com.skyblockexp.ezcountdown.listener.actions;
+
+import com.skyblockexp.ezcountdown.api.model.Countdown;
+import com.skyblockexp.ezcountdown.listener.ChatInputListener;
+import com.skyblockexp.ezcountdown.manager.CountdownManager;
+import com.skyblockexp.ezcountdown.manager.MessageManager;
+import org.bukkit.Sound;
+import org.bukkit.entity.Player;
+import org.bukkit.event.inventory.InventoryClickEvent;
+
+import java.util.Locale;
+import java.util.Optional;
+
+public final class EditEndSoundAction implements GuiAction {
+    private final CountdownManager manager;
+    private final MessageManager messageManager;
+    private final ChatInputListener chatInputListener;
+    private final com.skyblockexp.ezcountdown.bootstrap.Registry registry;
+
+    public EditEndSoundAction(CountdownManager manager, MessageManager messageManager, ChatInputListener chatInputListener, com.skyblockexp.ezcountdown.bootstrap.Registry registry) {
+        this.manager = manager;
+        this.messageManager = messageManager;
+        this.chatInputListener = chatInputListener;
+        this.registry = registry;
+    }
+
+    @Override
+    public ActionResult handle(InventoryClickEvent event, Player player, String cdName, Optional<Countdown> countdownOpt) {
+        if (countdownOpt.isEmpty()) return ActionResult.none();
+        Countdown cd = countdownOpt.get();
+        player.sendMessage(org.bukkit.ChatColor.GRAY + "Enter end sound (Bukkit Sound enum) or 'none' to disable.");
+        SoundEditorHelper.sendAvailableSounds(player);
+        chatInputListener.request(player, input -> {
+            String value = input == null ? "" : input.trim();
+            if (value.equalsIgnoreCase("none") || value.isBlank()) {
+                cd.setEndSound(null);
+                manager.save();
+                player.sendMessage(messageManager.message("gui.edit.saved", java.util.Map.of("name", cdName)));
+                registry.scheduler().runTask(() -> registry.gui().editorMenu().openEditor(player, cd));
+                return;
+            }
+            try {
+                Sound.valueOf(value.toUpperCase(Locale.ROOT));
+                cd.setEndSound(value.toUpperCase(Locale.ROOT));
+                manager.save();
+                player.sendMessage(messageManager.message("gui.edit.saved", java.util.Map.of("name", cdName)));
+                registry.scheduler().runTask(() -> registry.gui().editorMenu().openEditor(player, cd));
+            } catch (IllegalArgumentException ex) {
+                player.sendMessage(org.bukkit.ChatColor.RED + "Invalid sound name: " + value);
+                SoundEditorHelper.sendAvailableSounds(player);
+            }
+        });
+        return ActionResult.handled();
+    }
+}
diff --git a/src/main/java/com/skyblockexp/ezcountdown/listener/actions/EditStartSoundAction.java b/src/main/java/com/skyblockexp/ezcountdown/listener/actions/EditStartSoundAction.java
new file mode 100644
index 0000000..322163f
--- /dev/null
+++ b/src/main/java/com/skyblockexp/ezcountdown/listener/actions/EditStartSoundAction.java
@@ -0,0 +1,55 @@
+package com.skyblockexp.ezcountdown.listener.actions;
+
+import com.skyblockexp.ezcountdown.api.model.Countdown;
+import com.skyblockexp.ezcountdown.listener.ChatInputListener;
+import com.skyblockexp.ezcountdown.manager.CountdownManager;
+import com.skyblockexp.ezcountdown.manager.MessageManager;
+import org.bukkit.Sound;
+import org.bukkit.entity.Player;
+import org.bukkit.event.inventory.InventoryClickEvent;
+
+import java.util.Locale;
+import java.util.Optional;
+
+public final class EditStartSoundAction implements GuiAction {
+    private final CountdownManager manager;
+    private final MessageManager messageManager;
+    private final ChatInputListener chatInputListener;
+    private final com.skyblockexp.ezcountdown.bootstrap.Registry registry;
+
+    public EditStartSoundAction(CountdownManager manager, MessageManager messageManager, ChatInputListener chatInputListener, com.skyblockexp.ezcountdown.bootstrap.Registry registry) {
+        this.manager = manager;
+        this.messageManager = messageManager;
+        this.chatInputListener = chatInputListener;
+        this.registry = registry;
+    }
+
+    @Override
+    public ActionResult handle(InventoryClickEvent event, Player player, String cdName, Optional<Countdown> countdownOpt) {
+        if (countdownOpt.isEmpty()) return ActionResult.none();
+        Countdown cd = countdownOpt.get();
+        player.sendMessage(org.bukkit.ChatColor.GRAY + "Enter start sound (Bukkit Sound enum) or 'none' to disable.");
+        SoundEditorHelper.sendAvailableSounds(player);
+        chatInputListener.request(player, input -> {
+            String value = input == null ? "" : input.trim();
+            if (value.equalsIgnoreCase("none") || value.isBlank()) {
+                cd.setStartSound(null);
+                manager.save();
+                player.sendMessage(messageManager.message("gui.edit.saved", java.util.Map.of("name", cdName)));
+                registry.scheduler().runTask(() -> registry.gui().editorMenu().openEditor(player, cd));
+                return;
+            }
+            try {
+                Sound.valueOf(value.toUpperCase(Locale.ROOT));
+                cd.setStartSound(value.toUpperCase(Locale.ROOT));
+                manager.save();
+                player.sendMessage(messageManager.message("gui.edit.saved", java.util.Map.of("name", cdName)));
+                registry.scheduler().runTask(() -> registry.gui().editorMenu().openEditor(player, cd));
+            } catch (IllegalArgumentException ex) {
+                player.sendMessage(org.bukkit.ChatColor.RED + "Invalid sound name: " + value);
+                SoundEditorHelper.sendAvailableSounds(player);
+            }
+        });
+        return ActionResult.handled();
+    }
+}
diff --git a/src/main/java/com/skyblockexp/ezcountdown/listener/actions/GuiActionRegistry.java b/src/main/java/com/skyblockexp/ezcountdown/listener/actions/GuiActionRegistry.java
index 6c001a1..902fd65 100644
--- a/src/main/java/com/skyblockexp/ezcountdown/listener/actions/GuiActionRegistry.java
+++ b/src/main/java/com/skyblockexp/ezcountdown/listener/actions/GuiActionRegistry.java
@@ -24,6 +24,8 @@ public class GuiActionRegistry {
     private final EditStartMessageAction editStartMessageAction;
     private final EditStartCountdownTargetAction editStartCountdownTargetAction;
     private final EditEndMessageAction editEndMessageAction;
+    private final EditStartSoundAction editStartSoundAction;
+    private final EditEndSoundAction editEndSoundAction;
     private final ToggleDisplayTypeAction toggleDisplayTypeAction;
     private final CommandsEditorActions commandsEditorActions;
 
@@ -40,6 +42,8 @@ public GuiActionRegistry(CountdownManager manager, MessageManager messageManager
         this.editStartMessageAction = new EditStartMessageAction(manager, messageManager, chatInputListener, registry);
         this.editStartCountdownTargetAction = new EditStartCountdownTargetAction(manager, messageManager, chatInputListener, registry);
         this.editEndMessageAction = new EditEndMessageAction(manager, messageManager, chatInputListener, registry);
+        this.editStartSoundAction = new EditStartSoundAction(manager, messageManager, chatInputListener, registry);
+        this.editEndSoundAction = new EditEndSoundAction(manager, messageManager, chatInputListener, registry);
         this.toggleDisplayTypeAction = new ToggleDisplayTypeAction(manager, messageManager, displayEditor);
         this.commandsEditorActions = new CommandsEditorActions(manager, messageManager, chatInputListener, commandsEditor, registry);
     }
@@ -64,6 +68,8 @@ public Optional<GuiAction> forEditorSlot(int slot) {
             case 6 -> Optional.of(editStartMessageAction);
             case 7 -> Optional.of(editStartCountdownTargetAction);
             case 8 -> Optional.of(editEndMessageAction);
+            case 9 -> Optional.of(editStartSoundAction);
+            case 10 -> Optional.of(editEndSoundAction);
             default -> Optional.empty();
         };
     }
diff --git a/src/main/java/com/skyblockexp/ezcountdown/listener/actions/SoundEditorHelper.java b/src/main/java/com/skyblockexp/ezcountdown/listener/actions/SoundEditorHelper.java
new file mode 100644
index 0000000..ca1821a
--- /dev/null
+++ b/src/main/java/com/skyblockexp/ezcountdown/listener/actions/SoundEditorHelper.java
@@ -0,0 +1,50 @@
+package com.skyblockexp.ezcountdown.listener.actions;
+
+import org.bukkit.ChatColor;
+import org.bukkit.Sound;
+import org.bukkit.entity.Player;
+
+import java.util.Arrays;
+
+final class SoundEditorHelper {
+    private SoundEditorHelper() {}
+
+    static void sendAvailableSounds(Player player) {
+        String[] names = Arrays.stream(Sound.values())
+                .map(SoundEditorHelper::soundName)
+                .sorted()
+                .toArray(String[]::new);
+
+        player.sendMessage(ChatColor.AQUA + "Available sounds (" + names.length + "):");
+        player.sendMessage(ChatColor.DARK_GRAY + "Use one exact enum value; input is case-insensitive.");
+
+        final int perLine = 6;
+        for (int i = 0; i < names.length; i += perLine) {
+            StringBuilder line = new StringBuilder(ChatColor.YELLOW.toString());
+            int end = Math.min(i + perLine, names.length);
+            for (int j = i; j < end; j++) {
+                if (j > i) {
+                    line.append(ChatColor.GRAY).append(", ").append(ChatColor.YELLOW);
+                }
+                line.append(names[j]);
+            }
+            player.sendMessage(line.toString());
+        }
+    }
+
+    private static String soundName(Sound sound) {
+        if (sound == null) {
+            return "";
+        }
+        try {
+            java.lang.reflect.Method nameMethod = sound.getClass().getMethod("name");
+            Object value = nameMethod.invoke(sound);
+            if (value instanceof String s) {
+                return s;
+            }
+        } catch (Exception ignored) {
+            // Fallback for API variants where Sound is not a Java enum type.
+        }
+        return String.valueOf(sound);
+    }
+}
diff --git a/src/main/java/com/skyblockexp/ezcountdown/manager/CountdownManager.java b/src/main/java/com/skyblockexp/ezcountdown/manager/CountdownManager.java
index dcfb909..3b488fc 100644
--- a/src/main/java/com/skyblockexp/ezcountdown/manager/CountdownManager.java
+++ b/src/main/java/com/skyblockexp/ezcountdown/manager/CountdownManager.java
@@ -24,6 +24,7 @@
 import com.skyblockexp.ezcountdown.integration.discord.DiscordWebhookSender;
 import com.skyblockexp.ezcountdown.compat.scheduler.TaskHandle;
 import org.bukkit.Bukkit;
+import org.bukkit.Sound;
 import com.skyblockexp.ezcountdown.bootstrap.Registry;
 import com.skyblockexp.ezcountdown.manager.LocationManager;
 import com.skyblockexp.ezcountdown.type.CountdownTypeHandler;
@@ -459,6 +460,7 @@ private void fireStart(Countdown countdown) {
             displayManager.broadcastMessage(messageManager.formatWithPrefix(message,
                     Map.of("name", countdown.getName())));
         }
+        playConfiguredSound(countdown.getStartSound(), countdown.getName(), "start");
         // Teleport players if configured
         String teleportLocation = getTeleportLocation(countdown, "start");
         if (teleportLocation != null) {
@@ -492,6 +494,7 @@ private void fireEnd(Countdown countdown) {
             displayManager.broadcastMessage(messageManager.formatWithPrefix(message,
                     Map.of("name", countdown.getName())));
         }
+        playConfiguredSound(countdown.getEndSound(), countdown.getName(), "end");
         // Teleport players if configured
         String teleportLocation = getTeleportLocation(countdown, "end");
         if (teleportLocation != null) {
@@ -633,6 +636,26 @@ private void executeEndCommands(Countdown countdown) {
         }
     }
 
+    private void playConfiguredSound(String configuredSound, String countdownName, String phase) {
+        if (configuredSound == null || configuredSound.isBlank()) {
+            return;
+        }
+        final Sound sound;
+        try {
+            sound = Sound.valueOf(configuredSound.toUpperCase(Locale.ROOT));
+        } catch (IllegalArgumentException ex) {
+            registry.plugin().getLogger().warning("Invalid " + phase + " sound '" + configuredSound + "' for countdown '" + countdownName + "'.");
+            return;
+        }
+        for (Player player : Bukkit.getOnlinePlayers()) {
+            try {
+                player.playSound(player.getLocation(), sound, 1.0f, 1.0f);
+            } catch (Exception ignored) {
+                // Best effort; continue delivering to other players.
+            }
+        }
+    }
+
     private String normalizeName(String name) {
         return name == null ? "" : name.toLowerCase(Locale.ROOT);
     }
diff --git a/src/main/java/com/skyblockexp/ezcountdown/storage/YamlCountdownStorage.java b/src/main/java/com/skyblockexp/ezcountdown/storage/YamlCountdownStorage.java
index e47a0fb..ec4a4e4 100644
--- a/src/main/java/com/skyblockexp/ezcountdown/storage/YamlCountdownStorage.java
+++ b/src/main/java/com/skyblockexp/ezcountdown/storage/YamlCountdownStorage.java
@@ -100,6 +100,8 @@ public void saveCountdowns(Collection<Countdown> countdowns) {
             section.set("messages.format", countdown.getFormatMessage());
             section.set("messages.start", countdown.getStartMessage());
             section.set("messages.end", countdown.getEndMessage());
+            section.set("sounds.start", countdown.getStartSound());
+            section.set("sounds.end", countdown.getEndSound());
             section.set("commands.end", countdown.getEndCommands());
             section.set("zone", countdown.getZoneId().getId());
             section.set("timezone", countdown.getZoneId().getId());
@@ -152,6 +154,8 @@ private Countdown parseCountdown(String name, ConfigurationSection section, List
         String format = section.getString("messages.format", defaults.formatMessage());
         String start = section.getString("messages.start", defaults.startMessage());
         String end = section.getString("messages.end", defaults.endMessage());
+        String startSound = section.getString("sounds.start", null);
+        String endSound = section.getString("sounds.end", null);
         List<String> endCommands = section.getStringList("commands.end").stream().filter(command -> command != null && !command.isBlank()).toList();
         String zoneKey = section.isSet("timezone") ? section.getString("timezone") : section.getString("zone", defaults.zoneId().getId());
         ZoneId zoneId = ZoneId.of(zoneKey);
@@ -189,6 +193,8 @@ private Countdown parseCountdown(String name, ConfigurationSection section, List
         }
 
         Countdown countdown = new Countdown(name, type, displayTypes, updateInterval, visibility, format, start, end, endCommands, zoneId, autoRestart, startCountdown, restartDelay, alignToClock, alignInterval, missedPolicy, bossColor, bossStyle);
+        countdown.setStartSound(startSound);
+        countdown.setEndSound(endSound);
         countdown.setRunning(section.getBoolean("running", type != CountdownType.MANUAL));
 
         switch (type) {
diff --git a/src/main/java/com/skyblockexp/ezcountdown/type/DurationHandler.java b/src/main/java/com/skyblockexp/ezcountdown/type/DurationHandler.java
index 9e4d80a..5b58071 100644
--- a/src/main/java/com/skyblockexp/ezcountdown/type/DurationHandler.java
+++ b/src/main/java/com/skyblockexp/ezcountdown/type/DurationHandler.java
@@ -40,6 +40,8 @@ public Countdown parse(String name, ConfigurationSection section, CountdownDefau
         String format = section.getString("messages.format", defaults.formatMessage());
         String start = section.getString("messages.start", defaults.startMessage());
         String end = section.getString("messages.end", defaults.endMessage());
+        String startSound = section.getString("sounds.start", null);
+        String endSound = section.getString("sounds.end", null);
         List<String> endCommands = section.getStringList("commands.end").stream().filter(c -> c != null && !c.isBlank()).collect(Collectors.toList());
         String zoneKey = section.isSet("timezone") ? section.getString("timezone") : section.getString("zone", defaults.zoneId().getId());
         ZoneId zone = ZoneId.of(zoneKey);
@@ -56,6 +58,8 @@ public Countdown parse(String name, ConfigurationSection section, CountdownDefau
         BarStyle bossStyle = parseBossBarStyle(section.getString("display.bossbar.style", "SOLID"));
 
         Countdown countdown = new Countdown(name, getType(), displayTypes, updateInterval, visibility, format, start, end, endCommands, zone, autoRestart, startCountdown, restartDelay, alignToClock, alignInterval, missedPolicy, bossColor, bossStyle);
+        countdown.setStartSound(startSound);
+        countdown.setEndSound(endSound);
         countdown.setRunning(section.getBoolean("running", defaults.startOnCreate()));
         String durationValue = section.getString("duration", "0s");
         long seconds = parseDurationLegacy(durationValue);
diff --git a/src/main/java/com/skyblockexp/ezcountdown/type/FixedDateHandler.java b/src/main/java/com/skyblockexp/ezcountdown/type/FixedDateHandler.java
index 4fdcdd6..a73c2fb 100644
--- a/src/main/java/com/skyblockexp/ezcountdown/type/FixedDateHandler.java
+++ b/src/main/java/com/skyblockexp/ezcountdown/type/FixedDateHandler.java
@@ -44,6 +44,8 @@ public Countdown parse(String name, ConfigurationSection section, CountdownDefau
         String format = section.getString("messages.format", defaults.formatMessage());
         String start = section.getString("messages.start", defaults.startMessage());
         String end = section.getString("messages.end", defaults.endMessage());
+        String startSound = section.getString("sounds.start", null);
+        String endSound = section.getString("sounds.end", null);
         List<String> endCommands = section.getStringList("commands.end").stream().filter(c -> c != null && !c.isBlank()).collect(Collectors.toList());
         String zoneKey = section.isSet("timezone") ? section.getString("timezone") : section.getString("zone", defaults.zoneId().getId());
         ZoneId zone = ZoneId.of(zoneKey);
@@ -60,6 +62,8 @@ public Countdown parse(String name, ConfigurationSection section, CountdownDefau
         BarStyle bossStyle = parseBossBarStyle(section.getString("display.bossbar.style", "SOLID"));
 
         Countdown countdown = new Countdown(name, getType(), displayTypes, updateInterval, visibility, format, start, end, endCommands, zone, autoRestart, startCountdown, restartDelay, alignToClock, alignInterval, missedPolicy, bossColor, bossStyle);
+        countdown.setStartSound(startSound);
+        countdown.setEndSound(endSound);
         countdown.setRunning(section.getBoolean("running", defaults.startOnCreate()));
         String target = section.getString("target");
         if (target == null) throw new IllegalArgumentException("Missing target date for fixed date countdown.");
diff --git a/src/main/java/com/skyblockexp/ezcountdown/type/ManualHandler.java b/src/main/java/com/skyblockexp/ezcountdown/type/ManualHandler.java
index 9129a37..bb0f0e0 100644
--- a/src/main/java/com/skyblockexp/ezcountdown/type/ManualHandler.java
+++ b/src/main/java/com/skyblockexp/ezcountdown/type/ManualHandler.java
@@ -40,6 +40,8 @@ public Countdown parse(String name, ConfigurationSection section, CountdownDefau
         String format = section.getString("messages.format", defaults.formatMessage());
         String start = section.getString("messages.start", defaults.startMessage());
         String end = section.getString("messages.end", defaults.endMessage());
+        String startSound = section.getString("sounds.start", null);
+        String endSound = section.getString("sounds.end", null);
         List<String> endCommands = section.getStringList("commands.end").stream().filter(c -> c != null && !c.isBlank()).collect(Collectors.toList());
         String zoneKey = section.isSet("timezone") ? section.getString("timezone") : section.getString("zone", defaults.zoneId().getId());
         ZoneId zone = ZoneId.of(zoneKey);
@@ -56,6 +58,8 @@ public Countdown parse(String name, ConfigurationSection section, CountdownDefau
         BarStyle bossStyle = parseBossBarStyle(section.getString("display.bossbar.style", "SOLID"));
 
         Countdown countdown = new Countdown(name, getType(), displayTypes, updateInterval, visibility, format, start, end, endCommands, zone, autoRestart, startCountdown, restartDelay, alignToClock, alignInterval, missedPolicy, bossColor, bossStyle);
+        countdown.setStartSound(startSound);
+        countdown.setEndSound(endSound);
         countdown.setRunning(section.getBoolean("running", false));
         String durationValue = section.getString("duration", "0s");
         long seconds = parseDurationLegacy(durationValue);
diff --git a/src/main/java/com/skyblockexp/ezcountdown/type/RecurringHandler.java b/src/main/java/com/skyblockexp/ezcountdown/type/RecurringHandler.java
index b667cc2..9fadd40 100644
--- a/src/main/java/com/skyblockexp/ezcountdown/type/RecurringHandler.java
+++ b/src/main/java/com/skyblockexp/ezcountdown/type/RecurringHandler.java
@@ -41,6 +41,8 @@ public Countdown parse(String name, ConfigurationSection section, CountdownDefau
         String format = section.getString("messages.format", defaults.formatMessage());
         String start = section.getString("messages.start", defaults.startMessage());
         String end = section.getString("messages.end", defaults.endMessage());
+        String startSound = section.getString("sounds.start", null);
+        String endSound = section.getString("sounds.end", null);
         List<String> endCommands = section.getStringList("commands.end").stream().filter(c -> c != null && !c.isBlank()).collect(Collectors.toList());
         String zoneKey = section.isSet("timezone") ? section.getString("timezone") : section.getString("zone", defaults.zoneId().getId());
         ZoneId zone = ZoneId.of(zoneKey);
@@ -61,6 +63,8 @@ public Countdown parse(String name, ConfigurationSection section, CountdownDefau
         BarStyle bossStyle = parseBossBarStyle(section.getString("display.bossbar.style", "SOLID"));
 
         Countdown countdown = new Countdown(name, getType(), displayTypes, updateInterval, visibility, format, start, end, endCommands, zone, autoRestart, startCountdown, restartDelay, alignToClock, alignInterval, missedPolicy, bossColor, bossStyle);
+        countdown.setStartSound(startSound);
+        countdown.setEndSound(endSound);
         countdown.setRunning(section.getBoolean("running", true));
         countdown.setRecurringMonth(section.getInt("recurring.month", 1));
         countdown.setRecurringDay(section.getInt("recurring.day", 1));
diff --git a/src/main/java/com/skyblockexp/ezcountdown/util/CountdownCloner.java b/src/main/java/com/skyblockexp/ezcountdown/util/CountdownCloner.java
index 3df4160..3b56e52 100644
--- a/src/main/java/com/skyblockexp/ezcountdown/util/CountdownCloner.java
+++ b/src/main/java/com/skyblockexp/ezcountdown/util/CountdownCloner.java
@@ -13,6 +13,8 @@ public static void copyRuntimeFields(Countdown src, Countdown dest) {
         dest.setRecurringMonth(src.getRecurringMonth());
         dest.setRecurringDay(src.getRecurringDay());
         dest.setRecurringTime(src.getRecurringTime());
+        dest.setStartSound(src.getStartSound());
+        dest.setEndSound(src.getEndSound());
         dest.setRunning(src.isRunning());
     }
 }
diff --git a/src/main/resources/countdowns.yml b/src/main/resources/countdowns.yml
index ef19365..b71f15e 100644
--- a/src/main/resources/countdowns.yml
+++ b/src/main/resources/countdowns.yml
@@ -23,6 +23,11 @@ countdowns:
   #     format: "{translate:example.format}"
   #     start: "{translate:example.start}"
   #     end: "{translate:example.end}"
+  #   sounds:
+  #     # Optional Bukkit Sound enum names to play for all online players.
+  #     # Example: ENTITY_PLAYER_LEVELUP
+  #     start: "ENTITY_PLAYER_LEVELUP"
+  #     end: "BLOCK_NOTE_BLOCK_PLING"
   #   commands:
   #     end:
   #       - "say Countdown finished!"
diff --git a/src/test/java/com/skyblockexp/ezcountdown/api/model/CountdownBuilderTest.java b/src/test/java/com/skyblockexp/ezcountdown/api/model/CountdownBuilderTest.java
index f317e53..a3e09ee 100644
--- a/src/test/java/com/skyblockexp/ezcountdown/api/model/CountdownBuilderTest.java
+++ b/src/test/java/com/skyblockexp/ezcountdown/api/model/CountdownBuilderTest.java
@@ -52,4 +52,17 @@ void buildRecurringCountdown_setsRecurringFields() {
         assertEquals(25, c.getRecurringDay());
         assertEquals(t, c.getRecurringTime());
     }
+
+    @Test
+    void buildCountdown_setsStartAndEndSounds() {
+        Countdown c = CountdownBuilder.builder("sound-test")
+                .type(CountdownType.DURATION)
+                .startSound("ENTITY_PLAYER_LEVELUP")
+                .endSound("BLOCK_NOTE_BLOCK_PLING")
+                .durationSeconds(30)
+                .build();
+
+        assertEquals("ENTITY_PLAYER_LEVELUP", c.getStartSound());
+        assertEquals("BLOCK_NOTE_BLOCK_PLING", c.getEndSound());
+    }
 }
diff --git a/src/test/java/com/skyblockexp/ezcountdown/gui/GuiSoundEditorFeatureTest.java b/src/test/java/com/skyblockexp/ezcountdown/gui/GuiSoundEditorFeatureTest.java
new file mode 100644
index 0000000..1f0fe44
--- /dev/null
+++ b/src/test/java/com/skyblockexp/ezcountdown/gui/GuiSoundEditorFeatureTest.java
@@ -0,0 +1,157 @@
+package com.skyblockexp.ezcountdown.gui;
+
+import com.skyblockexp.ezcountdown.api.model.Countdown;
+import com.skyblockexp.ezcountdown.api.model.CountdownType;
+import com.skyblockexp.ezcountdown.listener.ChatInputListener;
+import com.skyblockexp.ezcountdown.test.MockBukkitTestBase;
+import org.bukkit.event.inventory.ClickType;
+import org.bukkit.event.inventory.InventoryAction;
+import org.bukkit.event.inventory.InventoryClickEvent;
+import org.bukkit.event.inventory.InventoryType;
+import org.junit.jupiter.api.Test;
+
+import java.lang.reflect.Field;
+import java.time.ZoneId;
+import java.util.EnumSet;
+import java.util.Map;
+import java.util.UUID;
+import java.util.function.Consumer;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertNull;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+public class GuiSoundEditorFeatureTest extends MockBukkitTestBase {
+
+    @SuppressWarnings("unchecked")
+        private static Map<UUID, Consumer<String>> pendingMap(ChatInputListener listener) throws Exception {
+        Field f = ChatInputListener.class.getDeclaredField("pending");
+        f.setAccessible(true);
+                return (Map<UUID, Consumer<String>>) f.get(listener);
+        }
+
+        private static boolean hasPending(ChatInputListener listener, UUID id) throws Exception {
+                return pendingMap(listener).containsKey(id);
+        }
+
+        private static Consumer<String> getPending(ChatInputListener listener, UUID id) throws Exception {
+                return pendingMap(listener).get(id);
+    }
+
+    @Test
+    public void editorSlotStartSound_registersChatInputRequest() throws Exception {
+        Countdown cd = new Countdown("gui-sound-start", CountdownType.MANUAL,
+                EnumSet.noneOf(com.skyblockexp.ezcountdown.display.DisplayType.class),
+                1, null, "{formatted}", "start", "end", java.util.List.of(), ZoneId.systemDefault());
+        cd.setDurationSeconds(10);
+        manager.createCountdown(cd);
+
+        var player = addPlayer("gui-sound-player-start");
+        registry.gui().editorMenu().openEditor(player, cd);
+
+        InventoryClickEvent click = new InventoryClickEvent(
+                player.getOpenInventory(), InventoryType.SlotType.CONTAINER,
+                9, ClickType.LEFT, InventoryAction.PICKUP_ALL);
+        plugin.getServer().getPluginManager().callEvent(click);
+
+        assertTrue(hasPending(registry.gui().chatInputListener(), player.getUniqueId()),
+                "Expected start sound slot to register chat input callback");
+    }
+
+    @Test
+    public void editorStartSoundInput_validValue_updatesCountdown() throws Exception {
+        Countdown cd = new Countdown("gui-sound-apply-start", CountdownType.MANUAL,
+                EnumSet.noneOf(com.skyblockexp.ezcountdown.display.DisplayType.class),
+                1, null, "{formatted}", "start", "end", java.util.List.of(), ZoneId.systemDefault());
+        cd.setDurationSeconds(10);
+        manager.createCountdown(cd);
+
+        var player = addPlayer("gui-sound-player-apply-start");
+        registry.gui().editorMenu().openEditor(player, cd);
+
+        InventoryClickEvent click = new InventoryClickEvent(
+                player.getOpenInventory(), InventoryType.SlotType.CONTAINER,
+                9, ClickType.LEFT, InventoryAction.PICKUP_ALL);
+        plugin.getServer().getPluginManager().callEvent(click);
+
+        Consumer<String> cb = getPending(registry.gui().chatInputListener(), player.getUniqueId());
+        assertNotNull(cb, "Expected pending callback for start sound input");
+
+        String validSound = "BLOCK.NOTE_BLOCK.PLING";
+        cb.accept(validSound);
+
+        assertEquals(validSound, cd.getStartSound());
+    }
+
+    @Test
+    public void editorStartSoundInput_none_clearsCountdownSound() throws Exception {
+        Countdown cd = new Countdown("gui-sound-clear-start", CountdownType.MANUAL,
+                EnumSet.noneOf(com.skyblockexp.ezcountdown.display.DisplayType.class),
+                1, null, "{formatted}", "start", "end", java.util.List.of(), ZoneId.systemDefault());
+        cd.setDurationSeconds(10);
+        cd.setStartSound("BLOCK.NOTE_BLOCK.PLING");
+        manager.createCountdown(cd);
+
+        var player = addPlayer("gui-sound-player-clear-start");
+        registry.gui().editorMenu().openEditor(player, cd);
+
+        InventoryClickEvent click = new InventoryClickEvent(
+                player.getOpenInventory(), InventoryType.SlotType.CONTAINER,
+                9, ClickType.LEFT, InventoryAction.PICKUP_ALL);
+        plugin.getServer().getPluginManager().callEvent(click);
+
+        Consumer<String> cb = getPending(registry.gui().chatInputListener(), player.getUniqueId());
+        assertNotNull(cb, "Expected pending callback for start sound input");
+
+        cb.accept("none");
+
+        assertNull(cd.getStartSound());
+    }
+
+    @Test
+    public void editorSlotEndSound_registersChatInputRequest() throws Exception {
+        Countdown cd = new Countdown("gui-sound-end", CountdownType.MANUAL,
+                EnumSet.noneOf(com.skyblockexp.ezcountdown.display.DisplayType.class),
+                1, null, "{formatted}", "start", "end", java.util.List.of(), ZoneId.systemDefault());
+        cd.setDurationSeconds(10);
+        manager.createCountdown(cd);
+
+        var player = addPlayer("gui-sound-player-end");
+        registry.gui().editorMenu().openEditor(player, cd);
+
+        InventoryClickEvent click = new InventoryClickEvent(
+                player.getOpenInventory(), InventoryType.SlotType.CONTAINER,
+                10, ClickType.LEFT, InventoryAction.PICKUP_ALL);
+        plugin.getServer().getPluginManager().callEvent(click);
+
+        assertTrue(hasPending(registry.gui().chatInputListener(), player.getUniqueId()),
+                "Expected end sound slot to register chat input callback");
+        assertNotNull(player.getOpenInventory());
+    }
+
+        @Test
+        public void editorEndSoundInput_validValue_updatesCountdown() throws Exception {
+                Countdown cd = new Countdown("gui-sound-apply-end", CountdownType.MANUAL,
+                                EnumSet.noneOf(com.skyblockexp.ezcountdown.display.DisplayType.class),
+                                1, null, "{formatted}", "start", "end", java.util.List.of(), ZoneId.systemDefault());
+                cd.setDurationSeconds(10);
+                manager.createCountdown(cd);
+
+                var player = addPlayer("gui-sound-player-apply-end");
+                registry.gui().editorMenu().openEditor(player, cd);
+
+                InventoryClickEvent click = new InventoryClickEvent(
+                                player.getOpenInventory(), InventoryType.SlotType.CONTAINER,
+                                10, ClickType.LEFT, InventoryAction.PICKUP_ALL);
+                plugin.getServer().getPluginManager().callEvent(click);
+
+                Consumer<String> cb = getPending(registry.gui().chatInputListener(), player.getUniqueId());
+                assertNotNull(cb, "Expected pending callback for end sound input");
+
+                String validSound = "BLOCK.NOTE_BLOCK.PLING";
+                cb.accept(validSound);
+
+                assertEquals(validSound, cd.getEndSound());
+        }
+}
diff --git a/src/test/java/com/skyblockexp/ezcountdown/listener/actions/SoundEditorHelperUnitTest.java b/src/test/java/com/skyblockexp/ezcountdown/listener/actions/SoundEditorHelperUnitTest.java
new file mode 100644
index 0000000..2fd9c1f
--- /dev/null
+++ b/src/test/java/com/skyblockexp/ezcountdown/listener/actions/SoundEditorHelperUnitTest.java
@@ -0,0 +1,24 @@
+package com.skyblockexp.ezcountdown.listener.actions;
+
+import org.bukkit.Sound;
+import org.bukkit.entity.Player;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.mockito.ArgumentMatchers.contains;
+import static org.mockito.Mockito.atLeastOnce;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.verify;
+
+public class SoundEditorHelperUnitTest {
+
+    @Test
+    public void sendAvailableSounds_sendsHeaderAndKnownSoundNames() {
+        Player player = mock(Player.class);
+
+        SoundEditorHelper.sendAvailableSounds(player);
+
+        verify(player, atLeastOnce()).sendMessage(contains("Available sounds ("));
+        assertTrue(Sound.values().length > 0, "Expected at least one Bukkit sound enum value");
+    }
+}
diff --git a/src/test/java/com/skyblockexp/ezcountdown/storage/YamlCountdownStorageRoundtripTest.java b/src/test/java/com/skyblockexp/ezcountdown/storage/YamlCountdownStorageRoundtripTest.java
index de27686..3b2dc98 100644
--- a/src/test/java/com/skyblockexp/ezcountdown/storage/YamlCountdownStorageRoundtripTest.java
+++ b/src/test/java/com/skyblockexp/ezcountdown/storage/YamlCountdownStorageRoundtripTest.java
@@ -50,6 +50,30 @@ public void saveAndLoadRoundtrip() throws Exception {
         tmp.delete();
     }
 
+        @Test
+        public void saveAndLoadRoundtrip_preservesStartAndEndSounds() throws Exception {
+                File tmp = File.createTempFile("countdowns-sounds", ".yml");
+                tmp.delete();
+                tmp.getParentFile().mkdirs();
+
+                CountdownDefaults defaults = new CountdownDefaults(EnumSet.noneOf(DisplayType.class), 1, null, "{formatted}", "start", "end", true, ZoneId.of("UTC"));
+                YamlCountdownStorage storage = new YamlCountdownStorage(defaults, tmp, java.util.logging.Logger.getLogger("test-sounds"));
+
+                Countdown cd = new Countdown("soundy", CountdownType.MANUAL, EnumSet.noneOf(DisplayType.class), 1, null, "{formatted}", "s", "e", List.of(), ZoneId.of("UTC"));
+                cd.setStartSound("ENTITY_PLAYER_LEVELUP");
+                cd.setEndSound("BLOCK_NOTE_BLOCK_PLING");
+
+                storage.saveCountdowns(List.of(cd));
+
+                YamlCountdownStorage reloader = new YamlCountdownStorage(defaults, tmp, java.util.logging.Logger.getLogger("test-sounds-reload"));
+                var loaded = reloader.loadCountdowns();
+                Countdown loadedCd = loaded.stream().filter(c -> c.getName().equals("soundy")).findFirst().orElseThrow();
+
+                assertEquals("ENTITY_PLAYER_LEVELUP", loadedCd.getStartSound());
+                assertEquals("BLOCK_NOTE_BLOCK_PLING", loadedCd.getEndSound());
+                tmp.delete();
+        }
+
     /**
      * Regression test for: duration countdown resets to full duration on server restart.
      *