Cheats
[Pause Game] and enter the codes during gameplay. A voice byte will play if the code was accepted.

All weapons - UP, DOWN, LEFT, RIGHT, LEFT, RIGHT, LEFT, LEFT
Inf ammo - UP, DOWN, LEFT, RIGHT, UP, LEFT, DOWN, RIGHT
Inf Necroplasm - UP, DOWN, LEFT, RIGHT, DOWN, LEFT, UP, RIGHT
No blood - UP, DOWN, LEFT, RIGHT, UP, UP, UP, UP.
Unlock all comics - UP, DOWN, LEFT, RIGHT, RIGHT, LEFT, LEFT, UP.
All missions - UP, DOWN, LEFT, RIGHT, LEFT, LEFT, RIGHT, RIGHT.
Encyclopedia - UP, DOWN, LEFT, RIGHT, LEFT,RIGHT, UP, DOWN.

Spawn: Armageddon Cheats (PS2)
# Level select

Pause the game and quickly press Up, Down, Left, Right, Left(2), Right(2). If you entered the code correctly, Spawn will speak.
# All weapons

Pause the game and quickly press Up, Down, Left, Right, Left, Right, Left(2). If you entered the code correctly, Spawn will speak.
# Infinite ammunition

Pause the game and quickly press Up, Down, Left, Right, Up, Left, Down, Right. If you entered the code correctly, Spawn will speak.
# Infinite Necroplasm

Pause the game and quickly press Up, Down, Left, Right, Down, Left, Up, Right. If you entered the code correctly, Spawn will speak.
# No blood

Pause the game and quickly press Up, Down, Left, Right, Up(4). If you entered the code correctly, Spawn will speak.
# Unlock all comics

Pause the game and quickly press Up, Down, Left, Right, Right, Left(2), Up. If you entered the code correctly, Spawn will speak.
# Unlock encyclopedia

Pause the game and quickly press Up, Down, Left, Right, Left, Right, Up, Down. If you entered the code correctly, Spawn will speak.
# Easy Souls

On level 7 (Power Behind The Throne), fight all the demons and leave through the exit door. Then, turn around and go back. All of them will be back.
# Defeating the Super Redeemer

When fighting the last Boss, the Super Redeemer, use the Brimstone Cannons. When you hit him, he will drop ammunition for various guns.