S.T.A.L.K.E.R.: Shadow of Chernobyl is a first-person shooter survival horror video game. The game is set in an alternative reality, where a second nuclear disaster occurs at the Chernobyl Nuclear Power Plant Exclusion Zone in the near future and causes strange changes in the area around it. The game has a non-linear storyline and features gameplay elements such as trading and two-way communication with NPCs. (wikipedia.org)