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The new co-op DLC, titled Peer Review, was just released this week. The best part, though, is that it's free. If you own Portal 2 on any platform you owe it to yourself to pick up this content right now – it's just that good.Peer Review takes place right after the conclusion of the cooperative story, placing you and your partner in control of the robots Atlas and P-Body. When you load into the cooperative test chambers a new area will be revealed. You can jump into the new DLC testing area whether or not you've finished the other cooperative levels, though the content is a continuation of the plot, and you might find yourself a bit lost if you haven't seen the rest of the robots' storyline.The levels in the DLC center on the psychotic AI GLaDOS' idea of "Art Therapy." GLaDOS is exploring her artistic side, and your team must get through a series of intense challenges to appease her whimsy. The story gets a bit more intense as you progress, so without exploring it I'll just leave it at this: it's a worthy addition to the Portal story arc, and something every fan should see. The same whip-crack humor and excellent writing that was lauded when Portal 2 released is still present, with some genuinely laugh-out-loud-moments.

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The test chambers themselves will challenge even the biggest brainiacs. Each room plays on skills that were taught in the previous cooperative levels, but tosses them together into new, satisfying combinations. The bottom line is this: if you've wanted more Portal content, you're getting it for free. Additional challenge levels and leaderboards are also included, but the cooperative storyline is the star of the show. If ever you needed a reminder about why Portal 2 could very well be the 2011 Game of the Year, the free Peer Review content is it.Want to check out some of the levels for yourself before you get to downloading? Enjoy the first three levels -- seen above and below -- in the included commentary videos. Watch as Nick Kolan and I bumble our way through some of the harder Portal content we've encountered, all the while having a complete blast.