Killzone is a first-person shooter

First-person shooter

First-person shooter is a video game genre that centers the gameplay on gun and projectile weapon-based combat through first-person perspective; i.e., the player experiences the action through the eyes of a protagonist. Generally speaking, the first-person shooter shares common traits with other...

 exclusive to the PlayStation 2

PlayStation 2

The PlayStation 2 is a sixth-generation video game console manufactured by Sony as part of the PlayStation series. Its development was announced in March 1999 and it was first released on March 4, 2000, in Japan...

 game console

Video game console

A video game console is an interactive entertainment computer or customized computer system that produces a video display signal which can be used with a display device to display a video game...

, developed by Netherlands

Netherlands

The Netherlands is a constituent country of the Kingdom of the Netherlands, located mainly in North-West Europe and with several islands in the Caribbean. Mainland Netherlands borders the North Sea to the north and west, Belgium to the south, and Germany to the east, and shares maritime borders...

-based Guerrilla Games

Guerrilla Games

Guerrilla Games is a first party video game developer and wholly owned subsidiary of Sony Computer Entertainment. The company is based in Amsterdam in the Netherlands, currently employs approximately 150 individuals, and is headed by managing director Hermen Hulst and development director Arjan...

 and released on November 2, 2004 in North America. A sequel, Killzone: Liberation

Killzone: Liberation

Received IGN's award for Best PSP Offline Multiplayer Game of 2006 .-External links:**...

was released on the PlayStation Portable

PlayStation Portable

The is a handheld game console manufactured and marketed by Sony Corporation Development of the console was announced during E3 2003, and it was unveiled on , 2004, at a Sony press conference before E3 2004...

 and another followup, Killzone 2 was released for the PlayStation 3

PlayStation 3

The is the third home video game console produced by Sony Computer Entertainment and the successor to the PlayStation 2 as part of the PlayStation series. The PlayStation 3 competes with Microsoft's Xbox 360 and Nintendo's Wii as part of the seventh generation of video game consoles...

 on February 27, 2009. Killzone 3

Killzone 3

Killzone 3 is a 2011 first-person shooter for the PlayStation 3, developed by Guerrilla Games and published by Sony Computer Entertainment. It is the fourth installment in the Killzone series, the first game in the series to be presented in 3D and the first to include motion controls using the...

, the fourth installment in the series, was released February 22, 2011. The games are First Person Shooters based (except Liberation) in a SC-FI setting and the series is currently exclusive to Playstation.
The game is set in an era of space colonization

Space colonization

Space colonization is the concept of permanent human habitation outside of Earth. Although hypothetical at the present time, there are many proposals and speculations about the first space colony...

 where the Helghast Empire has recovered from its defeat in the First Extrasolar War and launched a blitzkrieg

Blitzkrieg

For other uses of the word, see: Blitzkrieg Blitzkrieg is an anglicized word describing all-motorised force concentration of tanks, infantry, artillery, combat engineers and air power, concentrating overwhelming force at high speed to break through enemy lines, and, once the lines are broken,...

 against the outer Interplanetary Strategic Alliance (I.S.A.) colony planet Vekta.