A riding game machine for playing the game of a jet ski race, for example has a display unit for displaying a simulated image of an object on a wavy surface, and a riding device swingable depending on the simulated image displayed by the display unit. The riding device has a riding unit for a player...http://www.google.de/patents/US5951404?utm_source=gb-gplus-sharePatent US5951404 - Riding game machine
