diff --git a/config.json b/config.json
index 7be0b1d..db204c6 100644
--- a/config.json
+++ b/config.json
@@ -411,6 +411,14 @@
         "prerequisites": [],
         "difficulty": 2
       },
+      {
+        "slug": "rotational-cipher",
+        "name": "Rotational Cipher",
+        "uuid": "1c9c40a6-4af3-4691-9b15-554f4ccab5f1",
+        "practices": [],
+        "prerequisites": [],
+        "difficulty": 2
+      },
       {
         "slug": "scrabble-score",
         "name": "Scrabble Score",
diff --git a/exercises/practice/rotational-cipher/.docs/instructions.md b/exercises/practice/rotational-cipher/.docs/instructions.md
new file mode 100644
index 0000000..4bf64ca
--- /dev/null
+++ b/exercises/practice/rotational-cipher/.docs/instructions.md
@@ -0,0 +1,29 @@
+# Instructions
+
+Create an implementation of the rotational cipher, also sometimes called the Caesar cipher.
+
+The Caesar cipher is a simple shift cipher that relies on transposing all the letters in the alphabet using an integer key between `0` and `26`.
+Using a key of `0` or `26` will always yield the same output due to modular arithmetic.
+The letter is shifted for as many values as the value of the key.
+
+The general notation for rotational ciphers is `ROT + <key>`.
+The most commonly used rotational cipher is `ROT13`.
+
+A `ROT13` on the Latin alphabet would be as follows:
+
+```text
+Plain:  abcdefghijklmnopqrstuvwxyz
+Cipher: nopqrstuvwxyzabcdefghijklm
+```
+
+It is stronger than the Atbash cipher because it has 27 possible keys, and 25 usable keys.
+
+Ciphertext is written out in the same formatting as the input including spaces and punctuation.
+
+## Examples
+
+- ROT5 `omg` gives `trl`
+- ROT0 `c` gives `c`
+- ROT26 `Cool` gives `Cool`
+- ROT13 `The quick brown fox jumps over the lazy dog.` gives `Gur dhvpx oebja sbk whzcf bire gur ynml qbt.`
+- ROT13 `Gur dhvpx oebja sbk whzcf bire gur ynml qbt.` gives `The quick brown fox jumps over the lazy dog.`
diff --git a/exercises/practice/rotational-cipher/.meta/config.json b/exercises/practice/rotational-cipher/.meta/config.json
new file mode 100644
index 0000000..b87e185
--- /dev/null
+++ b/exercises/practice/rotational-cipher/.meta/config.json
@@ -0,0 +1,19 @@
+{
+  "authors": [
+    "BNAndras"
+  ],
+  "files": {
+    "solution": [
+      "rotational-cipher.arr"
+    ],
+    "test": [
+      "rotational-cipher-test.arr"
+    ],
+    "example": [
+      ".meta/example.arr"
+    ]
+  },
+  "blurb": "Create an implementation of the rotational cipher, also sometimes called the Caesar cipher.",
+  "source": "Wikipedia",
+  "source_url": "https://en.wikipedia.org/wiki/Caesar_cipher"
+}
diff --git a/exercises/practice/rotational-cipher/.meta/example.arr b/exercises/practice/rotational-cipher/.meta/example.arr
new file mode 100644
index 0000000..403167b
--- /dev/null
+++ b/exercises/practice/rotational-cipher/.meta/example.arr
@@ -0,0 +1,16 @@
+use context starter2024
+
+provide: my-rotate end
+
+fun my-rotate(phrase, shift-key):
+  string-explode(phrase).map(lam(char):
+    code = string-to-code-point(char)
+    ask:
+      | (97 <= code) and (code <= 122) then:
+        string-from-code-point(num-modulo(((code - 97) + shift-key), 26) + 97)
+      | (65 <= code) and (code <= 90) then:
+        string-from-code-point(num-modulo(((code - 65) + shift-key), 26) + 65)
+      | otherwise: char
+    end
+  end).join-str("")
+end
diff --git a/exercises/practice/rotational-cipher/.meta/tests.toml b/exercises/practice/rotational-cipher/.meta/tests.toml
new file mode 100644
index 0000000..53441ed
--- /dev/null
+++ b/exercises/practice/rotational-cipher/.meta/tests.toml
@@ -0,0 +1,40 @@
+# This is an auto-generated file.
+#
+# Regenerating this file via `configlet sync` will:
+# - Recreate every `description` key/value pair
+# - Recreate every `reimplements` key/value pair, where they exist in problem-specifications
+# - Remove any `include = true` key/value pair (an omitted `include` key implies inclusion)
+# - Preserve any other key/value pair
+#
+# As user-added comments (using the # character) will be removed when this file
+# is regenerated, comments can be added via a `comment` key.
+
+[74e58a38-e484-43f1-9466-877a7515e10f]
+description = "rotate a by 0, same output as input"
+
+[7ee352c6-e6b0-4930-b903-d09943ecb8f5]
+description = "rotate a by 1"
+
+[edf0a733-4231-4594-a5ee-46a4009ad764]
+description = "rotate a by 26, same output as input"
+
+[e3e82cb9-2a5b-403f-9931-e43213879300]
+description = "rotate m by 13"
+
+[19f9eb78-e2ad-4da4-8fe3-9291d47c1709]
+description = "rotate n by 13 with wrap around alphabet"
+
+[a116aef4-225b-4da9-884f-e8023ca6408a]
+description = "rotate capital letters"
+
+[71b541bb-819c-4dc6-a9c3-132ef9bb737b]
+description = "rotate spaces"
+
+[ef32601d-e9ef-4b29-b2b5-8971392282e6]
+description = "rotate numbers"
+
+[32dd74f6-db2b-41a6-b02c-82eb4f93e549]
+description = "rotate punctuation"
+
+[9fb93fe6-42b0-46e6-9ec1-0bf0a062d8c9]
+description = "rotate all letters"
diff --git a/exercises/practice/rotational-cipher/rotational-cipher-test.arr b/exercises/practice/rotational-cipher/rotational-cipher-test.arr
new file mode 100644
index 0000000..155bf56
--- /dev/null
+++ b/exercises/practice/rotational-cipher/rotational-cipher-test.arr
@@ -0,0 +1,43 @@
+use context starter2024
+
+include file("rotational-cipher.arr")
+
+check "rotate a by 0, same output as input":
+  my-rotate("a", 0) is "a"
+end
+
+check "rotate a by 1":
+  my-rotate("a", 1) is "b"
+end
+
+check "rotate a by 26, same output as input":
+  my-rotate("a", 26) is "a"
+end
+
+check "rotate m by 13":
+  my-rotate("m", 13) is "z"
+end
+
+check "rotate n by 13 with wrap around alphabet":
+  my-rotate("n", 13) is "a"
+end
+
+check "rotate capital letters":
+  my-rotate("OMG", 5) is "TRL"
+end
+
+check "rotate spaces":
+  my-rotate("O M G", 5) is "T R L"
+end
+
+check "rotate numbers":
+  my-rotate("Testing 1 2 3 testing", 4) is "Xiwxmrk 1 2 3 xiwxmrk"
+end
+
+check "rotate punctuation":
+  my-rotate("Let's eat, Grandma!", 21) is "Gzo'n zvo, Bmviyhv!"
+end
+
+check "rotate all letters":
+  my-rotate("The quick brown fox jumps over the lazy dog.", 13) is "Gur dhvpx oebja sbk whzcf bire gur ynml qbt."
+end
diff --git a/exercises/practice/rotational-cipher/rotational-cipher.arr b/exercises/practice/rotational-cipher/rotational-cipher.arr
new file mode 100644
index 0000000..462ec6b
--- /dev/null
+++ b/exercises/practice/rotational-cipher/rotational-cipher.arr
@@ -0,0 +1,7 @@
+use context starter2024
+
+provide: my-rotate end
+
+fun my-rotate(phrase, shift-key):
+  raise("Please implement the my-rotate function")
+end