At the beginning of Portal, all we explicitly knew was that we were a test subject, and that we had to complete tests to progress. To sustain a longer experience than Portal, and to offer eager fans the sustenance they craved, Portal 2 had to introduce new characters and tell a bigger, more explicit story, but that inevitably killed some of its charm. If you have played Portal, the first few chapters of Portal 2 will feel like repeating Kindergarten (put the cube on the button - got it), but once the game's new mechanics, such as the Discouragement Redirection Cubes, Aerial Faith Plates, and Repulsion Gel, are introduced, your brain will get its due stimulation. One of the primary joys of playing Portal 2 is surprising yourself with your own solutions - despite knowing that each test was designed guide me to toward one solution, I still felt like a genius when my seemingly hackneyed plans actually worked. Go in one portal, go out the other - the primary mechanic seems simple enough, but as the complexity of the 'test chambers' increases, the solutions become increasingly unexpected. If you've somehow never played Portal, Portal 2 will ease you into its puzzles with a gentle learning curve. Portal 2 returns the series' protagonist, Chell, to the testing grounds of the massive Aperture Science laboratory for another round of discombobulating puzzle solving, and another chance to escape.

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