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yes, with a "psp emulator"
the purpose of psp game is that you can experience the game by yourself :)
WWE 12 is not a PSP game and is a PS3 game and can not be played by the PSP
the game has to be game share compatible. you basically got to gameshare on your psp and then your friend loads the game up n his psp.
If its a psp game, it will run on any psp system (providing its not faulty). If its not a psp game, it wont work on the psp.