18 every game so 18 is the limit.
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Call of Duty Black Ops is four player split-screen, and 2 can play split-screen online.
Up to 4 players can play simultaneously in call of duty black ops multiplayer.
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
Only one player can play Call of Duty 3 for Wii.
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