PUBG: Battlegrounds - the game formerly known as PlayerUnknown's Battlegrounds - still holds the record for the biggest concurrent player count ever registered on Steam. It remains one of the biggest games on the platform, but it's nowhere near those early heights, even after going free-to-play. That's just a question of perspective, though, as the newly-relaunched game has reached well over a half-million concurrent players.
After its free-to-play launch today, PUBG reached a peak concurrent player count of 668,706, as SteamDB shows. That makes it the second-biggest game on Steam today (just behind Counter-Strike: Global Offensive), and would make it the sixth-biggest Steam game of all time, behind New World, Cyberpunk 2077, Dota 2, CS:GO, and, er, itself.
PUBG previously hit a peak of 3,257,248 players in January 2018, shortly after its 1.0 launch. That remains an astronomical, seemingly-untouchable record on Steam. Only three other Steam games - Cyberpunk, Dota, and CS:GO - have topped a million players, and PUBG is the only game to top two million, much less three.
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