The Simpson's:
Bart V's The Space Mutants

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.

Hint: 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.

Hint: 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.

Hint: Location of the heads:
On level one, buy a cherry bomb. Go to the pet shop, get above the window, and shoot it at the bird. Then, when you get to the Statue of Jebediah Springfield, get on the second line in back of the statue and shoot the bird with a rocket. This will provide the head of the statue, which will make Bart invincible for a short period of time. However, the heads are found in secret places on various levels. On level 2, reach the shoe level. When the first ballet shoes appear, keep jumping on that ashtray to collect coins, hats. Keep jumping to receive the head of the statue. Also on level 2, find the location where there is wet cement on the magic board. Between the fourth or fifth wand, jump as high as possible from the fourth to fifth wands. The head will appear on the fourth wand. On level 3, there is a big ladder that Bart climbs. Hit the kid at the top with the sling shot. Move all the way to the top of the ladder, and jump off. Land right on the board to receive three coins and the head from the statue from the prize section just left of the ladder.

Hint: Five coins:
Reach the big Krusty head in Level 3 (Krustyland). Jump on the red platform in between its eyes. Then, jump down to grab the extra life. Keep jumping straight up to enter a room that contains five coins.