First, pause the game, then, hold X and press Up, Down, Left, Right (3x), Down, Left.

Level skip

First, pause the game, then, hold X and press Right, Left, Up (3x), Right, Left, Left.

Infinite lives

First, pause the game, then, hold X and press Down, Down, Up, Down, Right, Down, Up, Up.

All extras and bonus levels

First, pause the game, then, hold X and press Right, Up, Up, Down, Right, Down, Right.

All characters

First, pause the game, then, hold X and press Left, Right, Left (3x), Up, Left, Left.

Temp invincibility

First, pause the game, then, hold X and press Left, Left, Up, Left, Down, Right (3x).

Make coins Mad Garibs

First, pause the game, then, hold X and press Right, Left, Right, Left, Up, Up, Left, Right.