diff --git a/12-key-sequence-detection/index.html b/12-key-sequence-detection/index.html
index f843840..fdb9e67 100644
--- a/12-key-sequence-detection/index.html
+++ b/12-key-sequence-detection/index.html
@@ -7,6 +7,15 @@
 </head>
 <body>
 <script>
+    const pressed = [];
+    const secretCode = 'great';
+window.addEventListener('keyup', (e) => {
+    pressed.push(e.key);
+    pressed.splice(-secretCode.length - 1, pressed.length - secretCode.length);
+    if (pressed.join('').includes(secretCode)) {
+        cornify_add();
+    }
+});
 </script>
 </body>
 </html>
\ No newline at end of file
