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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To read the rest of the comic, check it out on IGN.