Killzone is a first-person and third-person shooter series of video games exclusively for Sony Computer Entertainment's (SCE) video game consoles. The main series and the PSP installment was developed by Guerilla Games, a subsidiary of SCE. Killlzone currently consists of four games spanning over the PlayStation 2, the PlayStation Portable, and the PlayStation 3.
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Guerrilla Games couldn't have made iconic games like Horizon Zero Dawn and Killzone without its remarkable engine.