The Incredible Hulk

Level select:
Press Start to pause game play, then press Up, Right, Down, Left. Resume the game and intentionally lose all your lives. The level selection screen will appear when the next game starts. Note: This only works with a standard controller or a six-button controller in standard mode.

Moves:
The following moves must be done when "hulked out".
Information in this section was contributed by BTudi.

Bowling ball: Grab an opponent and rotate the D-pad in Full Circle Forward and press A. Press A again to bowl your opponent.
Shoulder charge: Press Forward(2), C, Forward.

Control demo:
Allow demo mode to begin and the CPU will eventually begin playing a level further in the game. When the CPU loses in demo mode, you can begin the game and start at that level.

Hint: Fight against Super Abomination:
On level 1, transform into Bruce Banner and continue the level by going down the ladder and travel through the sewer. Near the very end, you will fight a much faster and stronger version of the Abomination.
Information in this section was contributed by Louie.