GT Advance 3: Pro Concept Racing Cheats - GBA
Primary Collection of Cheats
All cars
Hold [L] + [B] and press [Left] at the title screen.
All tracks
Hold [L] + [B] and press [Right] at the title screen.
All tune ups
Hold [L] + [B] and press [Up] at the title screen.
Extra modes
Hold [L] + [B] and press [Down] at the title screen.