Mega Man ZX Codes -

Completion bonuses:
Successfully complete the game under the normal difficulty setting to unlock the hard difficulty setting.

Successfully complete and save the game with both Vent and Aile under at least the normal difficulty setting. Start a new game with the cleared game file and you can keep Model X after getting Model ZX.

Mega Man Zero 3 Bosses:
Have the Game Boy Advance game Mega Man Zero 3 in the cartridge slot. Bosses from that game will now appear during Mega Man ZX.


Mega Man Zero 4 Bosses:
Have the Game Boy Advance game Mega Man Zero 4 in the cartridge slot. Bosses from that game will now appear during Mega Man ZX.

Boss toys:
Defeat a Boss without hitting their Biometal areas to get a level 4 victory. This will unlock a toy version of that Boss in the back of Prarie's room.

Fistleo: Defeat Fistleo while avoiding his head. 
Flammole: Defeat Flammole while avoiding his arms. 
Hivolt: Defeat Hivolt while avoiding his wings. 
Hurricaune: Defeat Hurricaunce while avoiding her neck. 
Leganchor: Defeat Leganchor while avoiding his head. 
Lurerre: Defeat Luererre while avoiding her head. 
Protectos: Defeat Protectos while avoiding his chest. 
Purprill: Defeat Purprill while avoiding his arms..