The following are known Game Genie Codes for X-Men: Gamesmaster’s Legacy on SEGA Game Gear.

• Start With No Mutant Power
  002 644 195
• Start With 1/2 Mutant Power
  772 644 195
• Infinite Mutant Power
  3AA 2A7 2A2
• Mutant Power Is Used Quicker
  14A 267 C42
• Infinite Energy
  3AA BD7 2A2
• One Hit Is Fatal Most Of The Time
  AFA BA7 2AA
  00A BB7 E6E
• Start With Very Little Energy
  012 634 195
• Start With 1/2 Energy
  772 634 195
• Flash A Lot Longer After Getting Hit
  FFA A97 2A2
• 1 Hit And You’re Invisible
  000 2F7 19E
• Almost Invincible
  000 2B7 806