Go to the Extras menu and then select Cheats. Enter one of the following codes to unlock that cheat option.

Unlimited Enchanced Vision
Press Left, Right, Up, Down.

Unlimited Gas Mines
Press Right, Left(2), Up, Down, Right.

Unlimited Ground Pound
Press Right, Up, Right, Up, Left, Down.

Unlimited Invulnerability
Press Down(2), Up, Left.

Unlimited Laser Eyes
Press Left(2), Up, Right.

Unlimited Stealth Camo
Press Left, Down(3).

Unlimited SuperBark
Press Right, Left(2), Up, Down, Up.

Level select
Press Right, Up, Left, Right, Up, Right.

All Mini Games
Press Right, Up, Right(2).