Don't worry if you're an unsociable so-and-so -- you'll still be able to play Insomniac Game's co-operative platformer, Ratchet & Clank: All 4 One, in single-player if you prefer.

The game will work with an AI partner helping you through co-operative puzzles and the like. It totally won't be the same as playing the game in four-player co-op, but at least it won't render the game useless if you can't persuade anyone to be your friend.