Half-Life
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More people are playing Half-Life 2 now than at any point since Steam started keeping track
Taking a look at SteamDB, the hullabaloo around Half-Life 2's 20th anniversary has sent fans coming back to the single player FPS in droves: With a 24 hour peak of 52,027 players at the time of writing, that's more people playing Half-Life 2 than at any point since Steam started keeping track of concurrent players (or at least the data became available) in 2008.