Master code:
During gameplay, press Back, Up, Up, Down, Down, Left, Left, right, Right, Up, Left, Down, Right, Up, Up, L.

Full special:
During gameplay, press Back, Up, Down, Left, Right, Down, Up.

Disable HUD:
During gameplay, press Black, Up, Down, Left, Right, Up, Right.

Bonus Board:
During gameplay, press Back, Up, Down, Left, Right, Left, Up.

Alternate Colors:
During gameplay, press Back, Up, Down, Left, Right, Down, Left.

Thanks to Revolution reader Jeff, Skyla, Rem, and Ali!