Cheat mode
Pause game play and press [Left] + [C], [Up]x2, [Left], [Down]x2, [Right], [C]. The sound of a laser will confirm correct code entry. Resume game play and enter one of the following controller actions for the corresponding effect:
Level skip
Pause game play and hold [Right] + [C].
Change characters
Pause game play and press [Left] + [C].
Ninety-nine lives
Pause game play and press [Down] + [C], [Up], [Left], [Up], [Right]x2, [C].
Invincibility
Pause game play and press [Up] + [B], [Up], [Right], [Down], [Up], [Right], [Down]x2, [Up], [B]. The sound of a crash will confirm correct code entry. Resume game play. Pause game play again and press [Up] + [B] for invincibility. Note: This effect does not last through the entire game, but may be re-enabled.
Disable collision detection
Note: The following feature requires a six-button controller. Hold [Mode] + [X] + [Y] + [Z] at the Sega logo. Quickly press [Up]x2, [Down], [Down/Left], [Left], [A], [B] + [C] at the title screen. The screen will flash to confirm correct code entry. Hold [Mode] during game play to walk through walls.
Fight Magneto X-Clone
Select and character besides Magneto and reach the X-Clone fight on the Brood Boss stage. The last character to be fought should not be the clone of your present character. Move down to the bottom of the black and yellow platforms, locate the bottom left corner and hit the wall. Enter the room to the upper right and hit the wall at this location. The X-Clone of Magneto will appear in this hidden area.