The original Portal nearly edged out the latest installment, but ultimately, the nod goes to Portal 2. Sure, the original is hysterical, succinct and reminded us all why we play video games but the plot and expanded backstory of the second, not to mention the robust co-op mode, made for a fuller experience.

In fact, the co-op mode could have been its own separate game and we still would have bought it. Playing with a friend and the four portals that you can wield, allows for all kinds of new variations on the theme.

The Peer Review DLC only made things better, adding a much-needed Challenge Mode and exanding the co-op campaign even furthur. The PC and Mac versions even have a free level editor to make your own puzzles.

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