Excellent game that went for a completely different tone than Portal 1 and succeeded. Was very lively, very fun, and very much having-the-best-cast-of-only-three-characters ever.
Portal's still better, though. Dat atmosphere.
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http://24.media.tumblr.com/tumblr_lvb2chGY8D1qm7gfoo1_500.jpg
SuperNiceDog? More like SuperChillGuy. Who is better than me at brackets by a mile.