The Portal 2 Peer Review DLC has been released on Xbox Live Arcade.

It's free.

It measures 1.37GB.

Peer Review follows the two loveable robots Body and Atlas as they try to out-fox GLaDOS through a new co-op test track. Silly old circuit-boards.

Eurogamer's Portal 2 reviewer Oli Welsh hailed Valve's game as a "masterpiece" earlier this year.

"Portal is perfect," he said. "Portal 2 is not."

"It's something better than that. It's human: hot-blooded, silly, poignant, irreverent, base, ingenious and loving. It's never less than a pure video game, but it's often more, and it will no doubt stand as one of the best entertainments in any medium at the end of this year. It's a masterpiece."

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Robert Purchese

Robert Purchese

Senior Staff Writer

Bertie is senior staff writer and Eurogamer's Poland-and-dragons correspondent. He's part of the furniture here, a friendly chair, and reports on all kinds of things, the stranger the better.

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