--- a/2048.html	Thu Sep 11 03:44:11 2014 +0300
+++ b/2048.html	Thu Sep 11 18:12:24 2014 +0300
@@ -441,6 +441,8 @@
     document.body.addEventListener("keydown", function(event) {
       if (document.activeElement.value)
         return;
+      if (event.altKey || event.ctrlKey || event.shiftKey || event.metaKey)
+        return;
       var key = event.keyCode || event.which;
       var keyMoves = {38: "up", 40: "down", 37: "left", 39: "right"};
       if (key in keyMoves) {