The Simpsons: Bart's Nightmare Cheats - Sega Genesis
Primary Collection of Cheats
Level select
Quickly press [A], [B]x2, [A], [Down], [Up], [Right]x2, [A] while Bart is falling during the opening sequence.
Control other characters
Complete the game with at least 250,000 and earn an A+ rating. Then, hold [Start] and press [A], [B], [A], [C], [B] during the ending credits. Other Simpsons characters will be selectable after the game restarts.