Surprised no one mentioned this actually. For those not familiar it's a shooter located on the site of the accident where the disaster produced various mutant monsters and an unstable environment. Really immersive with the difficulty, story and ambience. Haven't seen the movie it was based on.
Or the soviet era Andrei Tarkovsky movie Stalker based on the novel Roadside Picnic by the brothers Arkady and Boris Strugatsky (who also wrote the screenplay)?
The later is unrelated to the Chernobyl accident (in any direct sense) as it concerns unfathomable alien technology left as waste on earth after a visitation (or alien picnic along a galactic roadside) with human 'stalkers' raiding the unknown like ants after sugar.
Stalker the film is based on the Roadside Picnic story, btw.