3 player split-screen is unavailable on online play but you can do it in Combat Training, Split Screen, LAN Party and Zombies. All you need to do is connect 3 controllers and get each person to press X on PS3 or A on Xbox then hit start match.
On PC you would need 3 computers to play and Steam.
As far as I know, you can't. I know you can in Modern Warfare 2 but not in Black Ops. There is no game mode for that.
Black Ops 3 is not out yet. Sorry.
Millions of people play Call of Duty online. About 11 million accounts have been made and played on Black Ops.
no i don't think there is a way to play online with other people so my answer is no
yes
18
LIke 10-15 million people
Sadly, you can not. BUT you can play offline bots with 2 people.
yes
18, but half the people who play it are under 18
No there are more people that play Black Ops
Yes if you have Internet connection, you can play people online
No, you both need the game.
About 40 Million people play the Call of Duty franchise.