A game which two or more players can play, such as cards and mahjong, is played by connecting a home TV game machine with portable game machines having displays, where images for a common field are displayed on the TV, and private hands of a player, which should be concealed from the other players, are...http://www.google.com/patents/US6238291?utm_source=gb-gplus-sharePatent US6238291 - Cartridge, game machine and bi-directional communication type game system
