4,000 frames? Hold on, a game like this must be running at least 24 frames per second. That'd be 2.5 minutes (which is, of course, under 4 minutes, like the challenge states, but far enough to move it to "under 3 minutes" or something). If it was going to be in 4 minutes they should have just used getTimer(). Just a thought. In any case, fun game, though short, obviously.Nicely constructed.