Killzone: Liberation is a run and gun video game for the PlayStation Portable, developed by Guerrilla Games, and is the sequel to Killzone. Killzone: Liberation was released on October 31, 2006, in North America, November 3, 2006, in Europe and November 8, 2006, in Australia. The game chronologically continues two months after where the first game ended. Killzone: Liberation is the only PSP installment in the series, and was followed by Killzone: Mercenary on the PlayStation Vita. In Killzone: Liberation, players control Templar, a soldier in the ISA (Interplanetary Strategic Alliance) as he battles against the Helghast, a group of genetically enhanced soldiers. The game features a single-player campaign that follows Templar as he tries to rescue hostages and gather intelligence on the Helghast. It also includes a multiplayer mode in which players can compete against each other in various game modes. Killzone: Liberation is known for its strong graphics and gameplay, which build upon the foundations of the original Killzone game. It received generally positive reviews upon release, with many praising its solid controls and engaging story. Gameplay This game features a top-down isometric view in contrast to the original Killzone for the PlayStation 2, which is a first-person shooter. The resultant game can be seen as a mixture of a shooter and a dungeon crawler. The player controls Jan Templar. He can board and control several vehicles: heavy machine gun turrets, a tank, a hovercraft and a jetpack. During some levels a 'buddy' can be ordered around (although some are unarmed). These 'buddies' are normally teammates (Rico and Luger) or people that have to be rescued (the three VIP's in the third mission, first chapter and Evelyn in the third mission, fourth chapter). By collecting various pickups in the form of money cases, the player unlocks new weapons. These can be found in various weapons caches in certain levels. After enough money is amassed, the V2 upgraded weapons become available. The weapons in the caches are converted into the V2 upgraded versions. The player can unlock upgrades to Templar's abilities by completing challenge games within certain limits (such as shooting X number of targets without shooting the 'civilian' targets). These are ranked in bronze, silver and gold. Upgrades come in the form of carrying more items, hitting harder in close quarters combat, performing actions faster, unlimited ammunition or upgraded health. Multiplayer Infrastructure online multiplayer servers have been shut