A portable game system that uses polygon graphics to generate a 3-D player character, or body part such as a hand, moving through a 3-D simulated game space for display on an LCD screen in the portable game system. Overlaying an LCD screen is a touch screen that senses the variable locations of a physical...http://www.google.es/patents/US7347780?utm_source=gb-gplus-sharePatente US7347780 - Game system and game programs
