While guiding a group of scientists through the Zone, Scar faints during a high energy emission. If not adequately concealed, the player's nervous system shuts down, resulting in the player's death.

Emissions also occur on an infrequent basis, requiring the player to take cover in a building or underground area pointed out by the PDA. Emissions, powerful waves that are sometimes visible or invisible (determinant by intensity), unleash lethal radiation, psi-emissions, and other unknown particles and energy directly from the Chernobyl Nuclear Power Plant, directly affecting the Noosphere in The Exclusion Zone, making it deadly to all lifeforms except specific mutants. There are guides in the zone who will provide fast-travel for a fee. Non-player characters are given the ability to use hand grenades, take cover dynamically, and use 'blind-fire' techniques. Anomalies are harder to notice and now contain the artifacts in the game, which require a detector to locate. Other gameplay advancements since the first game include a deepened weapon customization system with the ability to repair damaged gear and add modifications that improve weapons and suits. Careful choice of faction alignment needs to be considered in some parts of the story, for it may be difficult to progress further if the Stalker who the player is interacting with is hostile, has needed information, or is essential to triggering the next stage. The Swamp-dwelling Renegades or the Military factions cannot be joined. While Scar is always aligned with Clear Sky, and his ultimate goal is to defeat Strelok, he can fight against or ally with the four other factions in the Zone (Loners, Duty, Freedom, and Bandits). Each of the main factions provide services, most importantly access to a trader and an engineer. The player character is a mercenary, and may do missions for any faction or remain completely neutral without disrupting the necessary progression of the game. The stronger a faction becomes, the better equipment the traders can provide and their soldiers can use. The player will be able to join and help factions in their battles.

Different factions will struggle for territory, attacking to gain territory and then defending to keep it, while others then try to retake it. The most significant gameplay addition since Shadow of Chernobyl is the faction wars system. This game combines elements of first-person shooters ('twitch-based' aiming, with a first-person perspective), survival horror (ammo-scavenging in a frightening atmosphere with powerful monsters), and role-playing video games (inventory management, quests, character interaction, armor types, and defense stats). S.T.A.L.K.E.R.: Clear Sky introduces features to the series, including the ability to customize weapon and armor, as well as participate in faction wars.ДЄ third game, S.T.A.L.K.E.R.: Call of Pripyat was released in 2009 as a sequel to Shadow of Chernobyl. The game uses much of the same regions as Shadow of Chernobyl, while introducing several new areas such as the abandoned town of Limansk. The player assumes the identity of Scar, a mercenary tasked with stopping a group of Stalkers from reaching the center of the Zone, a forbidden territory surrounding the Chernobyl Nuclear Power Plant. (these Gas anomalies can be seen from the top of the tower at the Village Ruins) - Bubble, Firefly, Kolobok, Meat Chunk, Soul, Stone Blood. In Gas anomalies on the large island west of Village ruins in the far west part of the swamps. (the first artifact to be found at the beginning of the game) - Jellyfish, Night Star, Stone Flower. In Springboard anomaly on an island northwest of Clear Sky base. It was developed by Ukrainian developer GSC Game World and published by Deep Silver as a prequel to S.T.A.L.K.E.R.: Shadow of Chernobyl. S.T.A.L.K.E.R.: Clear Sky is a 2008 first-person shootersurvival horror video game with role-playing elements. Genre(s)First-person shooter, survival horrorMode(s)Single-player, multiplayer

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