Megaman Powered Up
Megaman Mavericik Hunter X
Tekken 6
Grand Theft Auto: Chinatown Wars
Metal Gear Solid: Portable Ops
Megaman Powered up is the 1st, and only game of it's kind to allow stage creation/online sharing-rating... Maverick Hunter X can be downloaded from PSN if you do not want the UMD, or can't find it... I saw a review of GTA:CTW on Classic Game Room HD's youtube page.... That game looked so fun....
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PSone classics are always good if you have the space on your memory stick.