If you spent all of the first Portal mastering the myriad ways in which this can benefit you-for example, leaping from a dizzying height, shooting a new portal just before hitting the ground, then soaring out of another portal nearby to clear a yawning distance in just seconds-you can use all those skills here. You're still armed with a gun that lets you blast two portals, one blue and one orange, on many surfaces: Step into one portal and you'll emerge from the other with no change in your direction or momentum. This is despite few concrete changes to the way the game is played. Limited multiplayer and post-campaign options diminish replayability slightly, but in almost every way Portal 2 is just as amusing and exhilarating as its predecessor. But what the company has done overall is develop a sequel that stands up proudly to the original, employing the characteristics that made it a distinctive success without dulling their memory. With Portal 2 ($49.99 for PC, $59.99 for PlayStation 3 and Xbox 360), Valve has left intact the first quality, expanded and elaborated on the second, and addressed the third, if perhaps not substantially. Valve Software's 2007 game Portal was noteworthy for its witty and acerbic dialogue, creativity in blending the previously incompatible brain-teasing-puzzle-game and first-person-shooter genres, and relative shortness. Cooperative mode expansions get expensive quickly.How to Set Up Two-Factor Authentication.How to Record the Screen on Your Windows PC or Mac.How to Convert YouTube Videos to MP3 Files.How to Save Money on Your Cell Phone Bill.

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