Unlimited Shield: Beat the Hard Difficulty Setting

Choose your Left-Weapon: Beat Hard with an A on every Level

Unlimited Ammo: Beat Normal with an A for every level

Unlimited Grenades: Beat Hard with a B or higher on every level

Level Select (Normal): Beat the Game on Normal

Level Select (Hard): Beat the Game on Hard

Unlimited Health: Beat Hard with a C or higher for every level

Hard mode: Successfully complete the game under the normal difficulty setting to unlock the hard difficulty setting.

Level select: Successfully complete the game to unlock all levels under the same difficulty setting initially used.