It's a graphical remaster of Portal 2 that's mod-friendly and free (but requires the original game in your library). It uses an upgraded version of the Source engine called Strata Source, which also powers Momentum Mod.

P2CE on Steam

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[–] 7 points 6 months ago

If I remember correctly, that's Glados trolling you. None of the puzzles are impossible to complete as long as the game is running properly.

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