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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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There's also the "Unofficial Half Life 2 VR - unleashed" mod, which looks really exciting (I haven't tried it yet).
There's also a trailer for the mod.
edit: wordz edit 2: found a trailer