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Portal 2

Portal 2

No peace to the puzzles

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On the hole

A rich narrative supports the expanded fiction through excellent voice acting and scripting. Your new companion Wheately - an AI personality core, voiced superbly by Stephen Merchant - is the perfect bumbling, halfwit foil to GLaDOS's dispassionate sardonicism. But the unexpected show stealer has to be JK Simmons as Cave Johnson. Reminiscent of his turn as J Jonah Jameson in the Spiderman films, Simmons hits the perfect tone as the acerbic, no-nonsense father of Aperture Science, delivering arguably the funniest and most memorable performance in videogame history.

Portal 2

Off the wall

The Portal gun naturally returns as the game's cornerstone mechanic. By allowing you to teleport objects – including yourself - through otherwise impenetrable surfaces, the mechanic proves as ingenious and hilarious as ever. Nowhere more so than when harnessing gravity and momentum to catapult yourself across vast distances. Not content with a mere rehash of Portal, however, Valve slowly introduces an increasingly complex toolset which proves every bit as ingenious as the eponymous device.

Jump pads and laser-defracting cubes imbue early puzzles with refreshing novelty, but it's the appearance of the three physics-bending gels in the game's second half that really augments gameplay. Blue 'repulsion' gel bounces objects around with no loss of momentum, orange minimises friction to speed objects over its surface, and white paints portal-resistant surfaces to allow new locations for portaling.

Portal 2

Red, red, line...

The decision to exaggerate rather than merely repeat the original's playful physics proves Portal 2's greatest triumph. Puzzles combine the gels and other contrivances in truly inspirational arrangements. One minute you're ricocheting your way up vertiginous heights, and the next redirecting explosives towards gun turrets through newly created portal surfaces. All the time, Valve expertly balances the challenge between complexity and fairness, and you're only ever a eureka moment away from solving seemingly impossible puzzles.

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