Bloody Clothes ... Hold L + R + BLUE and input UP, DOWN, LEFT, RIGHT.
Clean Clothes ... Hold L + R + BLUE and input DOWN, UP, RIGHT, LEFT.

Enter the following codes while in the game:

Restore Health ... Hold L + R + BLUE and input DOWN, DOWN, DOWN, A, UP, UP, DOWN, UP, A.
Restore Ammo ... Hold L + R + BLUE and input RIGHT, RIGHT, DOWN, UP, LEFT, RIGHT, LEFT, LEFT.
Restore Ranged Weapon Ammo ... Hold L + R + BLUE and input LEFT, LEFT, UP, DOWN, RIGHT, LEFT, RIGHT, RIGHT, A.
Acquire Shotgun ... Hold L + R + BLUE and input LEFT, LEFT, LEFT, DOWN, DOWN, DOWN.
All Weapons/Items ... Hold L + R + BLUE and input DOWN, UP, DOWN, LEFT, RIGHT, LEFT, A, UP, LEFT, DOWN, RIGHT, UP, RIGHT, DOWN, LEFT, A, DOWN, DOWN, DOWN, A, A.
Restock Grenades ... Hold L + R + BLUE and input RIGHT, RIGHT, RIGHT, LEFT, LEFT, LEFT.
Molotov Cocktails ... Hold L + R + BLUE and input DOWN, DOWN, DOWN, UP, UP, UP.
Reveal All Maps ... Hold L + R + BLUE and input LEFT, RIGHT, DOWN, RIGHT, BLACK, LEFT, UP, LEFT.
Increase Evil Alignment ... Hold L + R + BLUE and input LEFT, LEFT, DOWN, UP.
Increase Good Alignment ... Hold L + R + BLUE and input UP, UP, RIGHT, UP.

Full Flashlight - Hold L + R + BLUE and input UP, LEFT, DOWN, RIGHT, UP, RIGHT, DOWN, LEFT, GREEN.
Invulnerability - Hold L + R + BLUE and input DOWN, UP, DOWN, UP.
Black and White mode - Hold L + R + BLUE and input UP, GREEN, LEFT, GREEN, DOWN, GREEN, RIGHT, GREEN.
Adjust Alignment to Evil - Hold L + R + BLUE and input LEFT, DOWN, LEFT, DOWN, LEFT, DOWN, GREEN.
Adjust Alignment to Good - Hold L + R + BLUE and input UP, RIGHT, UP, RIGHT, UP, RIGHT, GREEN.
Suicide - Hold L + R + BLUE and input DOWN, DOWN, DOWN, DOWN.
Unlock Chicken Gun - Hold L + R + BLUE and input LEFT, GREEN, GREEN, GREEN, RIGHT, LEFT, RIGHT, LEFT, UP, GREEN, GREEN, GREEN, DOWN, UP, DOWN, UP, GREEN.

To instantly kill a burrower, wait for the burrower to surface then simply throw a flash grenade into the hole it came from.