Looney Tunes: Back in Action - Action Replay Codes [US]
These codes were also known as GameShark Codes and in most cases will work on both devices.
These codes are for the U.S. version of the game.
Master Code – Must Be On
Code Indexes for Nintendo Game Boy Advance (GBA)
- Action Replay Code Index for Game Boy Advance
- Code Breaker Code Index for Game Boy Advance
- GameShark Code Index for Game Boy Advance