Instructions
Insert "Resistance: Retribution" into the PSP. Power on the PSP and press "Start."
Insert the plug end of the PSP USB cord into the port on top of the PSP. Insert the USB end of the PSP USB cord into an open USB port on the PlayStation 3.
Insert "Resistance 2" into the PS3 and wait for the game to load. Press "Start."
Scroll to "Options" on "Resistance 2" and press "X."
Scroll to "Connect PSP" and press "X." The PSP will be "infected" by the PS3, which is the process of synching the two devices. Press "X" on the PSP when the "Infected" screen appears to unlock new game options, controls and features.
Scroll to "Options" on "Resistance 2" and press "X."
Scroll to "Controls" and press "X."
Scroll to "Resistance: Retribution Plus" and press "X" to control "Resistance: Retribution" on the PSP with the PS3 controller.