Much like the iPhone game Collision Effect, Gap Monsters is a game that will make your brain ache. To begin with you can barely grasp what you're doing - you just do it. Later, as your understanding grows, it becomes something altogether more fascinating and cerebral.
Gap Monsters is that rare thing -- a flash game that doesn't feature zombies, gamification or any other gimmicks used to sell mediocrity. It's just a well designed, original concept, well implemented and infinitely playable.
Gap Monsters [Newgrounds]