I'm working on a 12 step rehabilitation program for Portal 2 puzzling. Each step is 1 puzzle chamber, it will be released step-by-step. Difficulty will be medium-hard. I will be exploring each puzzle mechanic at least once. So far there are 3 steps available on the Steam Portal 2 workshop, you can find them by searching for "Cave's Rehab". If anyone is interested in playtesting, feel free to get in touch.
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