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    Updated on May 13, 2020. Posted on Apr 11, 2011

    Portal 2: Lab Rat Comic

    By now you know there really was a cake, but who was the mysterious rat man who scribbled the hints and discouragements on the walls in the first place? In preparation for the much anticipated release of Portal 2 next week, Valve reveals more of the background on Aperture Science's unseen helper in Portal 2: Lab Rat.

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