Two of PlayStation Portable's most popular shooter games, Killzone: Liberation and Syphon Filter: Logan's Shadow, are now available in a UMD Dual Pack. The Helghast return with superb shooting action and high intensity graphics making Killzone Liberation a huge hit on PSP. Desperate. Alone. Betrayed. A follow up to Dark Mirror the robust online content available for Logan's Shadow catapult this title to a top PSP seller.