In-Game Reset
Press Start + Select + B + A during game play. Note: Do not use this while the Game Boy Advance is linked to a Gamecube or it may cause data loss.
Deleted Saved Games
Hold L + Right + Select when turning on the Game Boy Advance.
Ghost Mode
Hold B during your turn.
Glowing Field Training
To make the field training glow bright flashing gold at the beginning of Advance Wars, get an “A” rank on every mission in field training.
Advance Campaign Mode
Successfully complete campaign mode. Enter the battle maps screen and buy the “Advance Campaign” item for one coin. Hold Select and select campaign mode to begin and advanced campaign, with a more difficult CPU opponent.
Field Training Bonuses
Successfully complete field training mode to unlock the “War Room”, “Campaign”, “Design Maps”, “Stats”, and “Special Intel” options.
Quickly Finish Field Training
Select the final battle in Field Training. Win that battle to quickly unlock all options that normally require Field Training to be completed.