D3Publisher of America announced that PQ: Practical Intelligence Quotient, a 3D puzzle game that tests players problem solving skills, has shipped to retail stores, exclusively for PSP. Developed by Nowproduction of Osaka, PQ: Practical Intelligence uses the PSP system's Infrastructure Mode, allowing players to post their PQ score on the worldwide ranking site to see how they rank against other players around the world (press 'read more' for details).