Astro Boy: Tetsuwan Atom - Atom Heart no Himitsu CodeBreaker Codes (Japan)
This page contains CodeBreaker cheat codes for Astro Boy: Tetsuwan Atom - Atom Heart no Himitsu (Japan). If you're playing on an emulator you can usually input codes very easily by accessing a tab off the top of the toolbar. Anyone playing on a physical Gameboy will need to purchase a physical Gameshark device to use these codes.
If you're using an emulator and still can't figure out how to setup these codes, you're in luck! There's two common emulators for GBA games, the mGBA and VisualBoy Advance. Follow the link provided for the emulator you're using to be taken to a guide explaining how to get these codes working.
(Master Codes) Must Be On: 90FFA42C8827
Access all Stages: 49C9139B896B
Unlimited Lives: BAB670A370F4
Unlimited Super: A380070EEB39
Max all Stats: 12CBC272830E
Max Jet: 139760978AA8
Max Laser: 0293273281A4
Max Life: 1293663281A8
Max Punch: 1297643682A8
Max Score Multiplier: B3966402E8B5
Max Sensor: 0393239399A4
Max Shot: 0297253682A4
Maximum Life: BBB6748278F4
Unlock all Extras: 1643CE2545B2