Codes & Secrets
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..
To unlock this special model, some events must be done. After the completion of the mission of Area-M make sure to not leave the area after sending your mission report. Saving is crucial afterwards, so you will not die from Omega Zero, the final Boss from Mega Man Zero 3. Go to the other side of Transerver where it reads Area-N. Go to the second floor of the stage. Keep going until you see re-appearing metal floor steps. Proceed further until you see a floor of spikes. More of those metal floor steps are there. It will be faster to reach those steps with Model HX. After that there is a door. Once there you will fight Omega Zero. You should have Model ZX and at least two or three subtanks to defeat Omega Zero. After he is defeated, go back to where you started to get to Area-N. This time go to the last floor until you see two doors the require the Mega Man Zero 3 or 4 Game Boy Advance cartridges. Beyond those two doors is a room where a floating mysterious rock is hovering. Get it, then leave the area. The model can only be used after completing the game and playing your cleared saved game file. When doing this, playing your cleared file talk to Flueve. Give him the mysterious rock and he will confirm its a BioMetal. You are now in possession of BioMetal OX. Rio Ascani
Arcade mini-games Enter the arcade in Area C next to Transerver. To unlock the Crusher-F arcade machine for game play, defeat any two Bosses. To unlock the Mega Crusher-F machine, get over 100 points on the Crusher-F machine.