Level select
Press Start to pause game play, then quickly press Up, Down, Left, Right, Left, Left, Right, Right. Spawn will speak to confirm correct code entry.
All weapons
Press Start to pause game play, then quickly press Up, Down, Left, Right, Left, Right, Left, Left. Spawn will speak to confirm correct code entry.
Unlimited ammunition
Press Start to pause game play, then quickly press Up, Down, Left, Right, Up, Left, Down, Right. Spawn will speak to confirm correct code entry.
Unlimited health and Necroplasm
Press Start to pause game play, then quickly press Up, Down, Left, Right, Right, Left, Down, Up. Spawn will speak to confirm correct code entry. Alternately, press Start to pause game play, then quickly press Up, Down, Left, Right, Up(3). Spawn will speak to confirm correct code entry.
Unlimited Necroplasm
Press Start to pause game play, then quickly press Up, Down, Left, Right, Down, Left, Up, Right. Spawn will speak to confirm correct code entry.
No blood
Press Start to pause game play, then quickly press Up, Down, Left, Right, Up, Up, Up, Up. Spawn will speak to confirm correct code entry.
Unlock all comics
Press Start to pause game play, then quickly press Up, Down, Left, Right, Right, Left, Left, Up. Spawn will speak to confirm correct code entry.
Unlock encyclopedia
Press Start to pause game play, then quickly press Up, Down, Left, Right, Left, Right, Up, Down. Spawn will speak to confirm correct code entry.
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.