It seems that you're using an outdated browser. Some things may not work as they should (or don't work at all).
We suggest you upgrade newer and better browser like: Chrome, Firefox, Internet Explorer or Opera

This game is done perfectly in every way, every option that people could possibly think of is in this game, and those that are excluded (for example co-op) are done so for good reason, My only wish is that more games like this would be made.