diff --git a/questions/18142-medium-all/README.md b/questions/18142-medium-all/README.md
new file mode 100644
index 000000000..ca0914f43
--- /dev/null
+++ b/questions/18142-medium-all/README.md
@@ -0,0 +1,11 @@
+Returns true if all elements of the list are equal to the second parameter passed in, false if there are any mismatches.
+
+For example
+
+```ts
+type Test1 = [1, 1, 1]
+type Test2 = [1, 1, 2]
+
+type Todo = All<Test1, 1> // should be same as true
+type Todo2 = All<Test2, 1> // should be same as false
+```
diff --git a/questions/18142-medium-all/info.yml b/questions/18142-medium-all/info.yml
new file mode 100644
index 000000000..5f2757199
--- /dev/null
+++ b/questions/18142-medium-all/info.yml
@@ -0,0 +1,7 @@
+difficulty: medium
+title: All
+author:
+  github: cutefcc
+  name: cutefcc
+tags: array
+
diff --git a/questions/18142-medium-all/template.ts b/questions/18142-medium-all/template.ts
new file mode 100644
index 000000000..9227ddaa8
--- /dev/null
+++ b/questions/18142-medium-all/template.ts
@@ -0,0 +1 @@
+type All = any
diff --git a/questions/18142-medium-all/test-cases.ts b/questions/18142-medium-all/test-cases.ts
new file mode 100644
index 000000000..df8ad145b
--- /dev/null
+++ b/questions/18142-medium-all/test-cases.ts
@@ -0,0 +1,13 @@
+import type { Equal, Expect } from '@type-challenges/utils'
+
+type cases = [
+  Expect<Equal<All<[1, 1, 1], 1>, true>>,
+  Expect<Equal<All<[1, 1, 2], 1>, false>>,
+  Expect<Equal<All<["1", "1", "1"], "1">, true>>,
+  Expect<Equal<All<["1", "1", "1"], 1>, false>>,
+  Expect<Equal<All<[number, number, number], number>, true>>,
+  Expect<Equal<All<[number, number, string], number>, false>>,
+  Expect<Equal<All<[null, null, null], null>, true>>,
+  Expect<Equal<All<[[1], [1], [1]], [1]>, true>>,
+  Expect<Equal<All<[{}, {}, {}], {}>, true>>,
+];