Campaign = 1 Player
Multiplayer (except Ground War) = 12 (6 in your party)
Ground War (only available on next-gen consoles) = 18 (9 in your party)
Extinction = 4
Squads = 12 (6 in your party)
4 players
offline:4 players online:50 players
Up to 4 players locally and up to 24 players online
i believe 367458,7858695846795,984756843567.
Only one player can play Call of Duty 3 for Wii.
Look at the Game they do not call it Call of Duty 8
Many players of the game Fortress 2 dislike the game play of Call of Duty because of the story line and the plots of the COD series.
4
Call of Duty Black Ops is four player split-screen, and 2 can play split-screen online.
Currently, the number of sales is not known, however Activision announced that they "Sold in" $1 billion worth of copies of Call of Duty: Ghosts, however, "Sold through" is the operative term, meaning the copies people actually bought -- which is still unknown. However, I can tell you that the sales are dropping right now for Ghosts.
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
call of duty black ops is the worst game in history and is 0 players