Killzone 2 is a 2009 first-person shooter developed by Guerrilla Games and published by Sony Computer Entertainment for the PlayStation 3. It is the second main installment in the Killzone series, following 2004's Killzone. Similar to its predecessor, Killzone 2 takes place in the 24th century and chronicles the war between two human factions; the Vektans, and the Helghast. The game takes place two years after the events of Killzone and follows protagonist Tomas "Sev" Sevchenko as he and his unit battle the Helghast as the Vektans invade Helghan. The protagonist of Killzone and Killzone: Liberation, Cpt./Col. Jan Templar, returns in a supporting role, along with Rico Velasquez. Killzone 2 is played from a first-person view and allows the player to use a variety of weapons. It was released worldwide in February 2009. Killzone 2 was widely anticipated prior to its release. It was critically acclaimed by critics and fans, who praised it as a superior title to the original Killzone. Additional praise was given to the game's visuals, action, multiplayer modes, soundtrack and atmosphere, although criticism was directed at the narrative. The game's critical and commercial success led to a sequel, Killzone 3, which was released in February 2011. The official servers for Killzone 2 and Killzone 3 were shut down in March 2018. However, in 2021, a game preservation group called PSONE restored most of the game's online capability on their own set of servers. Gameplay Campaign The game is presented almost entirely from a first person perspective, aside from vehicular combat. Killzone 2 features a "lean and peek" cover system which allows the player to take cover behind an object and then pop out to fire at enemies. The "lean and peek" mechanic stays in first-person view at all times. It is also possible for the player to pilot vehicles at two points in the game: a tank and an exoskeleton. Many classic weapons and vehicles from previous Killzone installments return, such as the M82-G and the StA-52 LAR. The Sixaxis motion control feature is also utilized in performing certain actions such as turning a valve, arming an explosive charge and sniping. Multiplayer Warzone, the title of the online multiplayer component of Killzone 2 has been developed by Guerrilla Games in conjunction with the game's single-player campaign. The online multiplayer gameplay is class-based, meaning the player can choose a class of character which is specialized for a