Beautiful work here except for three problems I saw . Problem #1. Its a little bit too easy to win. Not a lot, just a little though. Problem #2. I had to refresh my browser in challenge mode because there was a tank stuck outside of the arena and neither one of us could hit or kill each other.(I think it was wave 7 but I'm not too sure). Problem #3. The "automatic freezing laser" combined with the "no.3 assassin" allows you to get up and walk away from the computer and still kill stuff. Outside of these minor problems I commend you on your exceptional game.