no you cant.
Chat with our AI personalities
There is no campaign for multiplayer. There is multiplayer which has no storyline, there is special ops where you can do co-op to do either a kind of campaign with a storyline with a friend or do survival mode to survive as many times as possible, or there is campaign mode, which is a single-player storyline.
Yes and no, there is a multiplayer mode which you can play online with your friends freely. But if you're talking about is campaign co-op then no, it's only a single player campaign.
The planet is only there for the single player campaign. You cannot travel to it in sandbox mode.
Yes, you can mod campaign mod on the Halo trial.
No, Dead Space 2's campaign mode will be completely solo.