After entering the Dr. Doom and Thanos codes, return to the character select screen. Hold Start, and push Up, Right, Down, Left, Up, Right, Down,
Left, Up, and push light, medium, heavy punch very quickly in that order.
Play through the game at least once single player. When selecting your character, hold Start and push down twice, then push Light, Medium, Roundhouse Kick punch very quickly in that order.
Play through the game at least once single player. When selecting your character, hold Start and push up twice, then push Fierce, Med, Light punch very
quickly in that order.