Free to keep when you get it before 20 Nov @ 12:00pm.
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Also Noclip has an anniversary documentary with the development team!! https://youtu.be/TbZ3HzvFEto?si=Vz2oZP3zYsdEitn0
Thank goodness this is free again. I got my friends all hyped on getting it just as Steam was removing the free version. Thank you Valve!