S.T.A.L.K.E.R.: Shadow of Chernobyl (Steam account)

https://store.steampowered.com/app/4500/STALKER_Shadow_of_Chernobyl/

In 1986, the world´s worst nuclear disaster occurred at the Chernobyl Nuclear Power Plant. Soviet authorities established an ´Exclusion Zone´ around, but a second explosion hit the reactor in 2006, creating The Zone as we know it – dangerous place, filled with mutated creatures, deadly radiation, and a strange, anomalous energy. The Zone was cordoned off by the military, who would shoot on sight anyone foolish enough to get inside.

Year 2012. The Zone is still a dangerous place and a threat to all mankind. Mercenaries, bounty hunters and explorers ventured further and further into the heart of the Zone driven by reports of strange ´artifacts´ imbued with anomalous energy. To sell them on the black market or trying to find the ´truth´ behind the Zone. Whatever their motivation, over time these individuals - Scavengers, Trespassers, Adventurers, Loners, Killers, Explorers and Robbers - have become known as S.T.A.L.K.E.R.s.

You will have to find your own way to survive in the Zone!

An immersive storyline, seamlessly blended with a living, breathing, non-linear open-world environment.
An accurately modeled real-world buildings and locations from deep inside of the Chernobyl Exclusion Zone.
Unique ´Survival FPS´ gameplay, which combines action, stealth, survival and RPG elements - to create an incomparable experience in the Zone.
Enemy Threat Evaluation AI system - NPC characters react to changes in environments and situations.
Realistic combat mechanics with accurate ballistic properties.
Dynamic day-night cycle and weather system, that directly impacts gameplay.
Advanced physics and dynamic lighting effects powered by the ´X-Ray Engine´.
Intense multiplayer action, supporting up to 32 players.