Krusty's Fun House, released as Krusty World (クリスティーワールド, Kurisutī Wārudo) in Japan, is a video game based on the cartoon series The Simpsons. Originally named Rat-Trap, it was developed by Fox Williams for the British software house Audiogenic, who licensed it to Acclaim Entertainment, the U.S.-based publishers of a range of games based on The Simpsons.
The game was released in 1992–1993 for the Amiga, NES, IBM PC, Sega Master System, Game Boy, Super NES and Mega Drive/Genesis. Acclaim published the console versions, and sub-licensed the home computer versions to Virgin. The 16-bit versions on the Super NES and the Mega Drive/Genesis were entitled Krusty's Super Fun House.
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 and Sideshow Mel.
The game has a password system, notably all the passwords are the names of actual Simpsons characters. The only exception is a password in the SNES version, which is "_Joshua_", a reference to the film WarGames.