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With the release of Space Age, Factorio has just reached its highest ever concurrent player count!
(lemmy.blahaj.zone)
Alt text for image: A SteamDB graph of the Factorio player count since release, with a current and all-time peak of 47,557 players
The sale thing is true, however the price per hour is still a good deal. If you are on the edge, try the free demo. The devs are one of the best and most active devs I've ever witnessed for a game, and they 100% deserve the money.