i dunno if ps2 games came already be played in the psp...i believe the psp's power still cannot match the ps2's own power...as for playing ps1 games, one option is to download it from the playstation store or use a popsloader...your firmware must be the custom firmware, not the original firmware from sony...3.71 is recommendable...if your psp is the 2000 edition (psp slim), then no need for popsloader...download the eboot file of the game then place the folder on the psp/game folder of your memory stick...=p