We're not sure about the Xbox 360 version yet, and it doesn't appear that the PC version will come with any extra functionality to it, but the Playstation 3 version of one of the most cult-classic-great games we've ever played will be coming with both Mac and PC versions attached. This PS3 version of the game comes with full Steam integration which will allow you to continue the game wherever you left of no matter which platform you decide to bring your Portal 2 Blu-Ray disk to.
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