Played through the SP twice. It was the best videogame experience I've ever had in my life, though I'm the first to admit that I have the worst memory that I can remember anyone having. Just the concept of Portal is incredibly innovative, and the level of sheer originality and intellectual challenge make the "aha" moment unforgettable. I remember playing the first Portal, and I remember that point changing my entire view of teleportation as a whole. The game's portals seemed completely original, simple yet with a level of complexity that blew my mind. Before that, teleportation to me was just ceasing to exist in one place and simultaneously beginning to exist in an entirely different place. Portal's vision of the concept was this magic hole in space that you could just walk through. I would never have thought to preserve momentum in teleportation, much less place limits on it. Portal 2 expanded on Portals uniqueness and places a story behind the incredibly unique gameplay. The first game's "story" wasn't really fleshed out, but in Portal 2, four characters create an epic story in which the smartest being decides the winner. The dynamic plot twists, the enhanced gameplay, the new testing elements, and the witty, well-developed characters make Portal 2 the most amazing game of the decade in my opinion. It provides a gaming experience made of the perfect blend of humor, unique gameplay, witty writing, cerebral challenge, action, drama, and story development. Whether or not there is a better game yet to come, there will never be another gaming experience quite like Portal 2. (Unless Valve announces Portal 3, in which case they would make more money on release day than Bill Gates will make in his entire life.)
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"Only two things are infinite, the universe and human stupidity, and I'm not sure about the former." - Albert Einstein