diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..951b3f3
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,4 @@
+*~
+.idea/
+
+
diff --git a/example.html b/example.html
new file mode 100644
index 0000000..05e711e
--- /dev/null
+++ b/example.html
@@ -0,0 +1,19 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+	<title>Konami code example</title>
+
+	<script src="konami.js"></script>
+
+	<script>
+		konami(function () {
+			var html = document.getElementsByTagName('html')[0];
+			html.style.backgroundColor = 'black';
+			html.style.color = 'white';
+		});
+	</script>
+</head>
+<body>
+blah blah
+</body>
+</html>
diff --git a/konami.js b/konami.js
new file mode 100644
index 0000000..9b9f420
--- /dev/null
+++ b/konami.js
@@ -0,0 +1,31 @@
+(function (window) {
+    "use strict";
+
+    var d = window.document;
+    var keys = [38, 38, 40, 40, 37, 39, 37, 39, 66, 65];
+    var progress = 0;
+
+    window.konami = function (h) {
+        var listener = function (e) {
+            if (e.keyCode == keys[progress]) {
+                if (++progress == keys.length) {
+                    console.log('コナミ');
+
+                    if (typeof h == 'function') {
+                        h();
+                    }
+
+                    progress = 0;
+                }
+            } else {
+                progress = 0;
+            }
+        };
+
+        if (d.addEventListener) {
+            d.addEventListener('keyup', listener);
+        } else {
+            d.onkeyup = listener;
+        }
+    };
+})(window);
