i think it is
its single player and multi player.
Single player?
no
Yes, in the co-op or single player campagin.
Nope and that would be a dumb idea too sorry:(
Left 4 dead, Left 4 dead 2. Zombie apocalypse on the xbox arcade. Call of duty black ops and world at war has a zombie mode. Red dead redemption has a zombie add-on for multilayer and single player
Only if you want to play online with other people otherwise theres a single player with A.I
Nope, you have to be online, or if more then one person is playing you both must be online
Yes
To receive campaign achievements, you must complete the entire campaign from start to finish on either single player (split screen) or campaign mode.
Yes!
nothing except a dead organism with only 1 cell left in the body....