When Sony launched the Playstation Vita in North America, backward compatability with PSP seemed to be far less extensive than was originally thought. At first, only 275 PSP games worked on the Vita, with PS Minis making up a substantial part of the list (a category most would agree is largely worthless). What seemed most amazing was the vast quantity of first party games that didn’t work (and continue not to work) on the next gen portable.
List Of Additional Sony PSP Games Compatible with Playstation Vita