The following are known Code Breaker Codes for Mobile Suit Gundam Seed: Battle Assault on Nintendo Game Boy Advance (GBA).

These codes are for the U.S. version of the game.

• Master Code – Must Be On
  0000E759 000A
  100003D6 0007
• Infinite HP P1
  3300053F 003B
• Infinite PS P1
  33000541 0029
• No PS P2
  330005A5 0000
• Infinite Truster Power P1
  33000543 001D
  Note: Turn off the switch after you beat the last enemy to view the end scene properly.
• No Trust Power P2
  330005A7 0000
  Note: Turn off the switch after you beat the last enemy to view the end scene properly.
• Unlock Very Hard Mode
  33000515 00FF
• Press Select For 1-Hit Kill
  D0000020 0004
  830005A3 0001
• Infinite Time (Time Limit Mode)
  83007618 4650
  Note: Do not use it with the No Time For Time Trials Mode.
• No Time For Time Trials Mode
  83007618 0000
  Note: Do not use it with the Infinite Time (Time Limit Mode).
• Have All Characters Unlocked/Cleared
  83007638 FFFF