- Unlockables
Successfully complete the indicated task to unlock the corresponding bonus:

5. Cpt. Xavier Jones	Successfully complete 'Man Down' on the Hard difficulty setting.
1. Cpt. Devin Ross	Kill 50 enemies using melee attacks.
35. Ki	Successfully complete 'Flesh' on the Hard difficulty setting.
3. Sgt. Frank Delgado	Pop 50 heads.
20. Grenadier	Kill 100 enemies using Ghost Bullet.
39. Sumerian Puppet	Successfully complete 'Flesh' on the Hard difficulty setting without being incapacitated.
21. Sir Richard de Gray	Successfully complete 'Out of the Frying Pan' on the Hard difficulty setting.
23. Warrior Crusader	Successfully complete 'Sewers' on the Hard difficulty setting.
31. Gladiator	Successfully complete 'Temple of Pain' on the Hard difficulty setting.
15. Corpses Behemoth	Successfully complete 'River of Blood' on the Hard difficulty setting.
10. Deceased Devin Ross	Successfully complete 'Still With You' on the Hard difficulty setting.
27. Centurion Textius Longinus	Successfully complete 'Decadence' on the Hard difficulty setting without being incapacitated.
9. Arnold Leech	Successfully complete 'Al Khali' on the Easy or Normal difficulty setting.
32. Antadurunnu	Successfully complete 'The God Seal' on the Hard difficulty setting.
36. Ninlil	Successfully complete 'Skin' on the Hard difficulty setting without being incapacitated.
33. Enlil	Successfully complete 'Spiritual Guide' on the Hard difficulty setting.
4. Sgt. Wilhelmina 'Billie' Church	Successfully complete 'Al Khali' on the Hard difficulty setting.
34. Inanna	Successfully complete 'Skin' on the Hard difficulty setting.
25. Child Crusader	Successfully complete 'Crusades' on the Easy or Normal difficulty setting.
29. Legionary	Successfully complete 'The Low Road' on the Hard difficulty setting.
40. Pyxis Prima	Successfully complete 'Sumeria' on the Easy or Normal difficulty setting.
6. Cpl. Simone Cole	Successfully complete 'The Tomb' on the Hard difficulty setting.
11. Cultist	Kill 100 enemies using melee attacks.
26. Bishop Malthus St. Claire	Successfully complete 'Crusades' on the Easy or Normal difficulty setting.
22. Brother William of Auxere	Successfully complete 'Motley Crew' on the Hard difficulty setting.
8. Agent Muriel Green	Successfully complete 'The Den of Souls' on the Hard difficulty setting.
24. Crossbowman Crusader	Successfully complete 'Tortured Souls' on the Hard difficulty setting.
17. Psychic Commander	Successfully complete 'World War 2' on the Easy or Normal difficulty setting.
42. The Jericho Team	Successfully complete 'Rivers of Blood' on the Hard difficulty setting without being incapacitated.
38. Utu	Successfully complete 'Blood' on the Hard difficulty setting without being incapacitated.
2. Lt. Abigail Black	Kill 50 enemies using Ghost Bullet.
19. Flamethrower	Disintegrate 100 enemies.
28. Governor Cassus Vicus	Successfully complete 'Rome' on the Easy or Normal difficulty setting.
37. Nanna	Successfully complete 'Blood' on the Hard difficulty setting.
12. Exlposive Cultist	Disintegrate 50 enemies.
30. Blind Behemoth	Successfully complete 'Morituri te salutant' on the Hard difficulty setting without being incapacitated.
7. Fr. Paul Rawlings	Pop 100 heads.
43. Operation	Godseal

- Three free codes
Although the game's cheat codes are encrypted and unique to your specific disc access code, you can get three free codes by using the following trick. First, make a note of the five digit access code that is unique to your disc by looking at the top of the 'Bonus Codes' screen. Then, go to the game's pre-order website, and enter 'AGEH-56JW-X2GB-DN1N-EGUT' as a pre-order code. Then, enter your five digit code, select your game system, and click 'Submit'. The cheat codes for the 'Infinite Ammo' and 'Fast Health Regeneration' options will be displayed for your game. Next, go to www.codemasters.com. Sign up for a free account, and log in. Go to their registration page, and register your game to get the cheat code for the 'Dominator Damage' option.