Pause the game, then press C, C, C, C, B, C, A, A, C, B, A to increase your score by 10,000.
Extra Time
To reset the clock, pause the game, then press Up, A, B, C, C, A, Up, C, C, C , Up.
Heal Sylvester
Pause the game, then press A, A, A, B, B, A, B, C.
Invincibility
Pause the game, then press B, B, Up, A, Left, Right, Down, Right, B, B, C for temporary invincibility.
Skip Train Level
In the game's third level (Mayhem Express) you can skip to the next stage by pausing the game and pressing C, C, B, C, A, B, C, A, B, C, Down.
Unlimited Continues
Pause the game, then press Right, Left, A, A, B, Up, C, A, B, B, C to add an extra continue to your reserve. Repeat as necessary to keep your continues maxed out.
View Credits
To skip to the end of the game and see the credits, pause the game and press Down, Right, A, B, B, B, C, C, B, A, A.
Warp To Hide And Shreak
To skip to the Hide and Shreak level (level five) pause the game and press AAA,BBB,ABC. You can use this password from any level.