S.T.A.L.K.E.R.: Clear Sky is a survival FPS game for PC based on a ‘what-if' scenario of the second Chernobyl Nuclear Power Plant accident. The game is created as a warning to mankind against mindless play with technologies. S.T.A.L.K.E.R.: Clear Sky is the official prequel to the renowned S.T.A.L.K.E.R. game by the Ukraine-based GSC Game World studio.

The game is set in 2011 and brings forth the events to have preceded the third campaign of Strelok to the Zone centre. S.T.A.L.K.E.R.: Clear Sky introduces an alternative look onto the events of the original game and offers the player to try himself out as a mercenary s.t.a.l.k.e.r. in search of his own path in the world of S.T.A.L.K.E.R.

• 10 hours of the main plotline gameplay
• New Zone territories. 5 completely new levels: Swamps, Red Forest, Ruined Hospital, Limansk, Military Ordnance Yard.
• 8 significantly re-designed levels from the original game: Cordon, Garbage, Dark Valley, Agroprom, Agroprom Undergrounds, Yantar, Military, Station.
• Weapon and armor upgrades
• Possibility to fix weapons
• Updated concepts of anomalies and artifacts - rare anomalies cannot be seen and are discovered only using detectors
• 36 weapon types
• 4 Multiplayer game modes
• 12 Multiplayer maps