are you talking about in a multiplayer match, how many players can play in it?
if so then it is 18 players max. (9 on each side) and less than 6 players means you play in pre-match until you get 6 players.
Anywhere from 1-4 players can play any of the maps at a time.
Call of Duty Black Ops is four player split-screen, and 2 can play split-screen online.
4
Up to 4 players can play simultaneously in call of duty black ops multiplayer.
call of duty black ops is the worst game in history and is 0 players
zombies 4 and multiplayer 18
18 every game so 18 is the limit.
The number of players is much less than at it's peak and Call of Duty Black Ops have many more players. That might change when MW3 comes out on November 8 2011
4 players
There is 15 prestiges in Call of Duty: Black Ops =)
offline:4 players online:50 players
Call of Duty Black Ops has already had the best release sales. MW2 is very Popular, yet many former MW2 players are now playing Black Ops and not just because it is newer and different.
Yes, Call of Duty: Black Ops will have online multiplayer just like many other Call of Duty video games.