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Half-Life 2 is currently 100% off for its 20th anniversary, plus a major update
(store.steampowered.com)
A gaming community free from the hype and oversaturation of current releases, catering to gamers who wait at least 12 months after release to play a game. Whether it's price, waiting for bugs/issues to be patched, DLC to be released, don't meet the system requirements, or just haven't had the time to keep up with the latest releases.
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All old valve games have long been deprecated on macOS since apple dropped support for 32 bit applications in 2019 and valve seems to have given up on mac gaming all together.