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Sometimes games are yanked without question. There's nothing that can be done about this but complain, or find another solution. Although it might be cheaper to grab the game digitally (if you don't own the PSP hardware), you'll still need a PSP in order to play the game anyway. Given that much, you can probably head out and grab a physical copy of the game these days along with the hardware if you're entirely up for getting your Ratchet and Clank on where the most important thing matters, that being size. 
