4 Players

4 player co-op games

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No specific order

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1. Syndicate

2. Rainbow Six Vegas 1(4 player co-op)

3. Ghost Recon Advanced Warfighter (16 player co-op)

4. Crackdown 2 (4 player co-op)

5. Marvel Ultimate Alliance (4 player co-op)

6. GRAW 1 and 2 (16 player co-op)

7. Halo 3 (4 player co-op)

8. Rock Band (4 player co-op)

9. Burnout Paradise (8 player co-op in online challenges)

10. Turok (4 player co-op 3 missions)

11. Rainbow Six Vegas 2 (4 player co-op)

12. GTA4 (4 player co-op misions)

13. Americas Army: True Soldiers (8 player co-op)

14. Viva Pinata Trouble in paradise (4 Player co-op)

15. Rock Band 2 (4 player co-op)

16. Call of Duty World at war (4 player co-op)

17. Left 4 Dead (4 player co-op)

18. Ghostbusters (4 player co-op)

19. Tom Clancy HAWK (4 player co-op)

20. FUEL (8 player co-op)

21. Guitar Hero 5

22. Operation Flashpoint (4 player co-op)

23. Borderlands (4 player co-op)

24. Left 4 Dead 2 (4 player co-op)

25. Lost Planet 2 (4 player co-op)

26. Halo Reach (4 player co-op)(not out yet)

27. Gears of War 3 (4 player co-op) (not out yet)

28. Mass Effect 3 (4 player co-op horde mode)

Are you after 4 player split screen campaigns, or just 4 player co-op campaigns.

I'm not aware of any 4 player split screen campaigns, but Halo supports 4 player co-op campaigns. You'd have to check each game, but I know Halo 5 and Halo Reach (I'm pretty sure) support 4 player co-op campaign

4 player would be perfect. 2 player is still good, but I'd like to see them patch the 4 player option in.

1. Pinball FX 2

2. Arkadian Warriors (3 player co-op)

3. Heavy Weapon (4 player co-op)

4. Streets Of Rage 2 (2 player co-op)

5. Contra (2 player co-op)

6. Castle Crashers (4 player co-op)

7. Doom (4 player co-op)

8. Portal Still Alive

Halo CE and Halo 2 the campaign is 2 player co op and 4 player multiplayer. Halo 3 and Halo 4 I believe are 4 player co op campaign and multiplayer.