The player directs small rats to an extermination area through complicated maze-like levels. The player controls Krusty the Clown who must navigate through his Krusty Brand Fun House. Each level is a puzzle in which a number of rats must be exterminated. Using different objects and obstacles, Krusty must create a path for the rats to follow, and guide them towards an extermination device. Other creatures such as snakes and flying pigs attempt to hinder Krusty's progress by injuring him; he must throw pies in order to defeat them. In each stage the extermination devices are run by a different character, including Bart, Homer, Corporal Punishment.

The player directs small rats to an extermination area through complicated maze-like levels. The player controls Krusty the Clown who must navigate through his Krusty Brand Fun House. Each level is a puzzle in which a number of rats must be exterminated. Using different objects and obstacles, Krusty must create a path for the rats to follow, and guide them towards an extermination device. Other creatures such as snakes and flying pigs attempt to hinder Krusty's progress by injuring him; he must throw pies in order to defeat them. In each stage the extermination devices are run by a different character, including Bart, Homer, Corporal Punishment.