wii doesn't have offline splitscreen for unknown reasons...
Yes
yes
No, only for Xbox360 and PS3.
Yes, it has up to 4 player splitscreen offline, and 2 player splitscreen online.
No there can not be 4 players on Call of Duty Black Ops Zombies on PS3 offline.
they have to get the kills first!
Yes.
you can't
Up to 4 players can play simultaneously in call of duty black ops multiplayer.
Yes.
no