Killzone: Liberation, released in 2006 for the PlayStation Portable (PSP), is a third-person shooter video game and the second installment in the Killzone franchise. Developed by Guerrilla Games, it diverges from the first game's first-person perspective and offers a unique isometric view. Players take on the role of Jan Templar on a mission to save captives and defend the planet Vekta from the Helghast invasion. This version, branded under the 'Greatest Hits', signifies its success and popularity among PSP games.