The following are known Game Genie Codes for X-Men 2: Clone Wars on SEGA Genesis.

• Infinite Lives
  AKRT-AA58
• Invincibility
  J6SB-8EY6
• Start With 9 Health After 1st Life
  ABRT-AWEE
• Start With 9 Lives
  BKRA-AAE0
• Start With 5 Lives
  A3RA-AAE0
• Fast Characters
  AYMB-8ALY
• Die With One Hit
  A0TB-8AA4
• Do Not Blink When Hit
  FTPB-84SE
• Untouchable
  AASB-8C20
• Partial Invincibility
  AASB-8A20
• One Hit And You Are Untouchable
  ATNB-9A0G
• All Characters Flash
  P2PB-82HC
• Do Not Flash When Hit
  A2PB-8AHR
• Hyper Characters
  AAMB-8A2G
• Running Hyper Speed
  2A3B-9APL

Wolverine Codes

• Regenerate All The Way Up To 9
  AB7B-WWDN
• Regenerate Up To 7
  AB7B-WRDN
• Regenerate Up To 5
  AB7B-WLDN
• Regenerate Twice As Fast
  2K7B-WCDG
• Regenerate Four Times As Fast
  6F7B-WADG
• Play As Magneto On Any Level
  RFMA-N60W