The following are known Code Breaker Codes for Mega Man Zero 4 on Nintendo Game Boy Advance (GBA).

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

• Infinite Energy – Level F
  320366A4 0020
  Note: This increases your “level” to F. If you get attacked with something too powerful, you will die even with this code.
• Always Have 9 Lives
  32035910 0009