One Life Mode
Complete all stages on Hard difficulty.
(Thanks to Dragonflame1408@aol.com)

Paintball Mode
Enter on Extras Screen: Right, Left, Right, Left, Down, Down, Up, Up.
(Thanks to Dragonflame1408@aol.com)

Unlock All Skins in Multi-player
Enter on Extras Screen: Down, Left, Up, Left, Right, Down, Left, Up.
(Thanks to Dragonflame1408@aol.com)