Cannon Spike Cheat Codes for Dreamcast

Play as Mega Man and B.B Hood
Successfully complete the game with any character on any difficulty setting. Press Left or Right at the character selection screen until Mega Man and B.B Hood appear.

Gallery art
Successfully complete the game with any character on any difficulty setting to unlock all art in the gallery.

Alternate Cammy's costume
At the character selection screen, highlight Cammy and press Up or Down.