diff --git a/12 - Key Sequence Detection/changi.html b/12 - Key Sequence Detection/changi.html
new file mode 100644
index 0000000..ca3ae48
--- /dev/null
+++ b/12 - Key Sequence Detection/changi.html	
@@ -0,0 +1,32 @@
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8" />
+    <title>Key Detection</title>
+    <script
+      type="text/javascript"
+      src="https://www.cornify.com/js/cornify.js"
+    ></script>
+  </head>
+  <body>
+    <script>
+      const pressed = [];
+      const secretcode = "asdf";
+
+      window.addEventListener("keyup", (e) => {
+        // console.log(e.key);
+        pressed.push(e.key);
+        pressed.splice(
+          -secretcode.length - 1,
+          pressed.length - secretcode.length
+        );
+        // console.log(pressed);
+
+        if (pressed.join("").includes(secretcode)) {
+          // console.log("ding ding");
+          cornify_add();
+        }
+      });
+    </script>
+  </body>
+</html>
