diff --git a/snippets_archive/collatz.md b/snippets_archive/collatz.md
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index a2b764087..000000000
--- a/snippets_archive/collatz.md
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@@ -1,16 +0,0 @@
----
-title: collatz
-tags: math,beginner
----
-
-Applies the Collatz algorithm.
-
-If `n` is even, return `n/2`. Otherwise, return `3n+1`.
-
-```js
-const collatz = n => (n % 2 === 0 ? n / 2 : 3 * n + 1);
-```
-
-```js
-collatz(8); // 4
-```
\ No newline at end of file
diff --git a/test/collatz.test.js b/test/collatz.test.js
deleted file mode 100644
index 29ea7e513..000000000
--- a/test/collatz.test.js
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-const {collatz} = require('./_30s.js');
-
-test('collatz is a Function', () => {
-  expect(collatz).toBeInstanceOf(Function);
-});
-test('When n is even, divide by 2', () => {
-  expect(collatz(8)).toBe(4);
-});
-test('When n is odd, times by 3 and add 1', () => {
-  expect(collatz(9)).toBe(28);
-});
-test('Eventually reaches 1', () => {
-  let n = 9;
-  while (true) {
-    if (n === 1) {
-      expect(n).toBe(1);
-      break;
-    }
-    n = collatz(n);
-  }
-});