Top 10 Ukrainian games by number of simultaneous players on Steam
And since it's S.T.A.L.K.E.R. week, let's compare the maximum Steam online of all the games in the series:
S.T.A.L.K.E.R. 2: Heart of Chornobyl – 113 587 players
S.T.A.L.K.E.R.: Shadow of Chernobyl – 2,308
S.T.A.L.K.E.R.: Call of Pripyat – 1,359
S.T.A.L.K.E.R.: Clear Sky – 889
Interestingly, the maximum online S.T.A.L.K.E.R.: Shadow of Chernobyl was in April 2022, when GSC Game World re-released the game on Steam, and S.T.A.L.K.E.R.: Call of Pripyat at the time of its original release on Steam in 2010. S.T.A.L.K.E.R.: Clear Sky showed the largest online audience in June 2021.