Gap Monsters is an incredibly original puzzle game that utilizes negative space. Your objective in each level is to guide the monster to its desginated block, which is outlined in red. Each level consists of a white background and a black foreground. The monsters are situated in the black spaces, but you can slide both the black and white spaces. If a portion of the background or foreground meets another portion of the same color, they will combine into one space, which may make it impossible for the monster to be moved to the goal.