The following are known CodeBreaker Codes for Altered Beast: Guardian of the Realms on Nintendo Game Boy Advance (GBA).

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

Code Breaker 1.1+ Required

• Master Code – Must Be On
  00006EA8 000A
  1003F3F8 0007
• Infinite Continues
  83000C9A 0200
• Infinite Lives
  33000C9C 0004
• Access All Realms
  33000DD6 000E
• Progress Complete
  43000DE8 0101
  00000014 0002
• Quick Score Gain
  83000CA0 FFFF
• Max Score
  83000CA0 E0FF
  83000CA2 05F5