Adding to the countless pre-E3 rumours that have been circulating around the net, Game Stop have listed a PSP game under the simple title of 'Sonic'. A previous interview with Takashi Iizuka on 1UP has confirmed Sega's intention to make a PSP game. Interestingly, the game is listed under Action/Adventure/Racing - could this be the rumoured Sonic 360 or, being a 'racing' game, the speculated Sonic R Extreme?