Level Skip: Pause the game, then simultaneously press Left and Button C. Next, press Up, Up, Left, Down, Down, Right, and Button C. If you've done the trick correctly, you'll hear a laser blast. Unpause the game, then pause it again, and simultaneously press Right and Button C to skip a level.

To change characters: First, you must enter the level-skip code.  Pause the game, then simultaneously press Right and C. Now pause the game and simultaneously press Left and C. Now you can change characters.

Invincibility: Pause the game and simultaneously press Up and Button B. Then press Up, Right, Down, Up, Right, Down, Down, Up, Button B. Unpause the game, and pause it again. Simultaneously press Up and Button B again, and you’ll be invincible.

99 Lives: Start a game and pause it. Simultaneously press Down and Button C, then press Up, Left, Up, Right, Right, Button C.