Star Wars: The Force Unleashed for the PSP is largely based off the PS2/Wii versions, but includes separate Force Unleashed mode and different multiplayer modes. In the Force Unleashed mode, the player can defeat stand-alone challenges, including force duels (defeat one or more force users), Order 66 (defeat many non-force users), and Historic Mission (play through a scene from a Star Wars movie). Three multiplayer modes are included: Force Frenzy (deathmatch), Rule the Galaxy (King of the Hill), and Force Out (toss your opponents outside the field). All three modes are for two to four players.
Shortly into the Galactic Empire's rule, Imperial spies locate a Jedi survivor of the Great Purge named Kento Marek on Kashyyyk. Darth Vader arrives as the planet is invaded and eliminates any Wookiee resistance between him and the fugitive Jedi. Reaching Kento's home, Vader easily defeats him in a lightsaber duel but senses someone far more powerful nearby. Initially believing it to be Kento's Jedi Master, Vader prepares to execute the defiant Jedi until his lightsaber is suddenly force-pulled from his hand by Kento's son, Galen. Sensing the boy's strong connection to the Force, Vader kills Kento and an Imperial squadron after they try to execute Galen and secretly takes him as his apprentice, with only a select few knowing of his existence. Years later, an adult Galen (given the alias "Starkiller") completes his Sith training. He's sent by Vader to eliminate several Jedi survivors across the galaxy in preparation for assassinating the Emperor so that the duo can rule the galaxy together. Starkiller travels aboard his ship, the Rogue Shadow, alongside training droid PROXY (who is programmed to try and kill Starkiller) and Imperial pilot Juno Eclipse. Starkiller's targets include Rahm Kota, a Clone Wars veteran and leader of a militia; Kazdan Paratus, insane after years of isolation on Raxus Prime;[d] and Shaak Ti, who's hiding on Felucia. Two of these three Jedi masters, Kota and Ti, inform Starkiller that they have foreseen that soon Vader will no longer be his master before he finishes them (with Ti committing suicide instead). After the latter's death, Starkiller returns to Vader again, but the Emperor arrives, his spies having uncovered Starkiller's existence. To prove his loyalty to the Emperor, Vader appears to kill his apprentice by stabbing him and hurling him through space.
