It might seem odd to pick a driving game for best multiplayer, since most multiplayer driving games tend to boil down to lap-times and checkered flags, but this is precisely what makes playing Burnout Paradise with others so brilliant.

You can still compete in standard online races, which are just as thrilling and full of stupendous car crashes as the single-player races. But the real fun lies in the cooperative challenges, which scale nicely from three to eight players, and which range from performing a series of specific acrobatic stunts to smashing the billboards that are scattered throughout Paradise City. The variety of the challenges is pretty great, and while they can get pretty tough, there's an easy pace to the action that makes Burnout Paradise a terrifically social experience.

Burnout Paradise also features one of the simplest, cleverest uses of the PlayStation Eye and Xbox Live Vision camera we've seen. Whenever you take down an online opponent, the game will snap a quick photo of the losing player, allowing you to ever-so-briefly savor the look of defeat in their face. It's great touches like this that turned Burnout Paradise into the game that we spent the most time playing together this year.

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Left 4 Dead puts players in the role of one of four survivors during a zombie apocalypse. Gamers are challenged to get from one safe house to another while facing clusters of "Infected." Co-op is key to survival in this fast paced game of zombie genocide.