At the Cheats screen in the Options menu, type in PLZDOME as a password.

Unlock All Characters

At the Cheats screen in the Options menu, put in Up, Up, Down, Down, Left, Right, Left, Right, BABA as a password.

Unlock All Keys

At the Cheats screen in the Options menu, type in SKELETON as a password.

Unlock Invulnerability

At the Cheats screen in the Options menu, type in HFUFU as a password.

Unlock Super Spin

At the Cheats screen in the Options menu, type in Left (4x), Right (4x), Left, Right, Left, Right, Up as a password.

Unlock Perfect Manuels

At the Cheats screen in the Options menu, type in QUEZDONTSLEEP as a password.