Pause the game and enter the following codes.

Full Health:
Left, Right, Left, Right, Right Trigger, Left Trigger, B, Y, Down.

Invincible:
Up, Down, Right, Down, Right Trigger, Black, Down, Y, Left Trigger.

Enable Tube:
Up, Down, Left, Right, Black, White, Y, Down, B

Switch to Equivalent Toon Version:
Up, Down, Up, Down, Right Trigger, Black, Down, B, Y.

Give All Ups:
Left, Left, Up, Up, Left Trigger, Black, B, Down, Y.

Give All Slams:
Right, Down, Up, Down, Down, Right Trigger, Y, B, Down.

Infinite Reaver Charge:
Down, Down, Up, Left, Right Trigger, Black, Down, Y, B.

All Dark Chronicles:
Right Trigger, Down, Black, Left Trigger, Right, Black, Y, Down, Left Trigger.

All Bonuses:
Black, Down, White, Right Trigger, Left,White, Down, Left Trigger, Y.

Wireframe:
Left Trigger, Down, Left Trigger, Up, Right Trigger, White, Left Trigger, Down, Y.

No Textures:
Left Trigger, Down, Black, Right, Black, Up, Y, Left Trigger, Down.

Thanks to Revolution readers Paolo Augello and Kjell!