록맨 제로 3 / 메가맨 제로 3

Ciel mini-game:
Successfully complete the game with an "S" rank on all missions.

Copy-X mini-game:
Successfully complete the game under the hard difficulty setting.

Fefnir mini-game:
Successfully complete all missions with 100 points. Alternately, slot in the MeteorRedSun Battle Chip.

Harpuia mini-game:
Successfully complete the game by only using the Zet Zaber and get an "S" rank. Alternately, slot in both the MeteorRedSun and BlueMoonRay Battle Chips.

Leviathan mini-game:
Successfully complete all missions with 100 points. Alternately, slot in the Counter2 or BlueMoonRay Battle Chips.

Phantom mini-game:
Successfully complete the game by only using the Buster Shot and get an "S" rank. Alternately, slot in both the MeteorRedSun and BlueMoonRay Battle Chips.

X mini-game:
Successfully complete the game, then use your cleared saved file to complete the game a second time.

Zero mini-game:
Successfully complete the game.

Hard difficulty setting:
Successfully complete the game, then highlight the "New Game" option at the main menu, hold L and press Start.

Ultimate difficulty setting:
Successfully complete the game after all the hidden discs have been collected. Then highlight the "New Game" option at the main menu, hold R and press Start.

Ex Skill:
Complete a Boss scene with an "A" or "S" rank to get an Ex Skill. There are twelve Ex Skills available. 

To get Ex Skills easily, when you are about to kill a Boss use the elf that gives you the A rank. Use it and kill the Boss you are fighting. At the results, you will get the Ex Skill. 

출처 : http://www.gamewinners.com/game_boy_advance/MegaManZero3.htm