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Yes, there are two modes, one to take on waves of enemies with you and your mate, and the other mode is the story mode where up to 3 people can play, I've tried playing it and the enemies are definitely harder to kill (as in you need to shoot them more) but fun to play though.. You can do this in CO-OP mode. :)
You have to go to either the story mode or the freeplay mode to start. Then make sure that your controllers are connected and enter the two player mode in either play mode.
In story mode? Doubt it but you can play online and stuff.
In Portal 2 Single Player Mode, there are 9 chapters. In the co-op mode, there are 5 chapters. If this helps any, there are 14 chapters in Single player COMBINED with co-op mode.
You can't play co-op in COD 3, unfortunately, World at War is the only COD with co-op campaign.
This all depends on the game that you have... if it is a game such as blackops you can not play co-op mode unless you go online, you cant do so in campaign mode. if you have world at war on the other hand you are able to play in co-op mode.
yes it is.
Yes. You can play Co-Op splitscreen in the Online mode and the Zombies Mode but not on the Campaign mode
nope
yes it can
No
Play zombie mode up to 4 player co op