The following are known Action Replay Codes for The Simpsons: The: Bart vs. the Space Mutants on SEGA Genesis / Mega Drive (Genesis).

The codes should work with the region specified but may work for other regions as well.

Device Compatibility: Action Replay

• Infinite Time
  FF01C3:99
• Infinite Lives
  FF01B4:09
• Infinite Hits
  FF01B5:03
• Infinite Spraypaint
  FF02C7:FF
• All Goals Done
  FF01C6:0000
• All Goals Complete (On Emulator)
  FF01C4:00
• Level Modifier (1-7) (On Actual System)
  FF01B9:000?
• Level Modifier (1-7) (On Emulator) 1
  FF01B7:000?
• Float
  FF01FF:006E
• Horizontal Scrolling Modifier 2
  FF01FA:XX
• Bart Glides Instead of Walks
  FF0209:08
• Letter Code 3
  FF026A:XX
• Cannot Be Touched
  FF0229:01
  FF0228:01
• Infinite Coins
  FF01A3:63

Footnotes

• 00 – Introduction
  01 – Maggie’s Stage
  02 – Marge’s Stage
  03 – Lisa’s Stage
  04 – Homer’s Stage
  05 – Reactor Stage
  06 – (Game Over Cutscene/Screen)
  07 – Game Ending
• 03 lets you walk for a bit and then scroll backwards. Discovered with a value of 09.
• This code seems to be the right address for the letters, but they never seem to work visually. If someone can figure out why this doesn’t work properly, I’ll gladly give them dual credit.