The Simpsons: Bart vs. the Space Mutants Cheats

The Simpsons: Bart vs. the Space Mutants Extra Lives and Sound Test
In Level 1, stand to the right of the "E" in the "Quick-E-Mart" sign. Shoot a rocket at the "E" to make a Krusty Clown Face appear that gives you three 1-Up's and a Sound Test. For the Sound Test, select it and press Start. Select sounds by pressing Up/Down, then press Start.

The Simpsons: Bart vs. the Space Mutants Free Coins
After you buy a whistle at the store, go to Grandpa Simpson's nursing home and use it. Wait awhile and Grandpa Simpson should start tossing you coins.

The Simpsons: Bart vs. the Space Mutants Hidden 1-Up
If you fire a Rocket at the E in Kwik-E-Mart a 1 up flies down.

The Simpsons: Bart vs. the Space Mutants Secret Room
The first ashtray past the escalator in the mall is the entrance to a secret room full of hats.

The Simpsons: Bart vs. the Space Mutants Theatre Bonus Room
If you enter the theater on the first level between 2:00 and 4:00, you will enter a bonus room. It may take a few tries.

The Simpsons: Bart vs. the Space Mutants Bonus (Level 1)
To get a bonus in the first level, go to the theatre at two or four o'clock. Wait at the entrance for the boy in purple to exit and spray him!