The Simpsons: Bart vs. the Space Mutants cheats for Nes
Sound test - Position Bart on the right side of the "E" on the "Quik-E-Mart" sign on level 1. Shoot the "E" with a rocket. A Krusty face will appear to confirm correct code entry. Three bonus lives and the sound test option will be available. Highlight the sound test and press Start. Press Up or Down and press Start to hear various game sounds.
Bonus screen - Enter the theater between 2:00 and 4:00.
Extra coins - Purchase the whistle from the Toys 'n' Stuff store and go to the nursing home. Blow the whistle and wait for Grandpa Simpson to begin throwing coins.
Winning the wheel game - Purchase the magnet from Toys N' Stuff store on level 1. When playing the wheel game on level 3, use the magnet while selecting a number. The magnet will allow that number to be selected by the wheel.