Nintendo Game & Watch were a series of electronic games invented by Gunpei Yokoi from 1980 - 1991. The first versions (Ball, Judge, Vermin, Lion, Helmet) only available in Japan and are now highly collectable. Most featured a game played on a single screen but later developed into multiscreen and table top versions. There are well over thirty different game & watch and can range from five pounds up to five hundred pounds for a mint in box Super Mario Bros F1 version (only 10,000) were produced as competition prizes. There have been many clones, most noticably from Russia and can still sell for a very good price especially if it is the rare 'EGG' which was discontinued due to a deal signed with Walt Disney to produce a Mickey Mouse version of the same game the former being most desirable. The series was discontinued to make way for the Nintendo Gameboy also created by Gunpei.
Gunpei Yokoi tragically died in a car accident in 1997.