Spawn: Armageddon

Pause the game, then press:
Up, Down, Left, Right, Up, Up, Up, Up           - No blood
Up, Down, Left, Right, Right, Left, Left, Up    - Unlock all comics
Up, Down, Left, Right, Left, Right, Up, Down    - Unlock encyclopedia
Up, Down, Left, Right, Left, Left, Right, Right - Level select
Up, Down, Left, Right, Left, Right, Left, Left  - All weapons
Up, Down, Left, Right, Up, Left, Down, Right    - Unlimited ammunition
Up, Down, Left, Right, Down, Left, Up, Right    - Unlimited Necroplasm

 