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Based on Valve Software's Portal, Portal: Flash Version lets you think with portals in your web browser. You must navigate your way through dozens of levels using only two interconnected portals. The portals are distinguished only by color. One leads to the other, and you must use the portals to solve various puzzles. Such a simple premise, and on a 2D game, seems like it would be easy, but you'' wrack your brain trying to solve the later levels.