plz help how do ya play online in co-op and campain????

Free play and public games for online

there is an option if you want to play solo you can change that to versus or co op

Go into campain.
Select a mission
Then. If you are online the top option will let you select who you allow to join you (ie friends, anyone, no one )
Then select co-op only or versus
And difficulty
Then hit start.
And your away

thanks iv worked it out now but thanks any ways to all