Mega Man Zero 2 Codes -

Hard difficulty setting:
Successfully complete the game. Then, highlight the "New Game" option and hold + . A sound will confirm correct code entry.

Graphics gallery:
Successfully complete the game under the hard difficulty setting. Then, highlight the "New Game" option and hold + + . A sound will confirm correct code entry.

Alternate Zero armors:
Successfully complete the game under the easy, normal, and hard difficulty settings. Then, press and press or until you get to a menu with Zero's helmet with a different color. There are pink, black, and red versions.