<Tr> <Th> Media </Th> <Td> Pre-installed software </Td> </Tr> <Tr> <Th> Successor </Th> <Td> Game Boy line </Td> </Tr> <P> Game & Watch (Japanese: ゲーム & ウオッチ Gēmu & Uotchi; called Tricotronic in West Germany and Austria) is a line of handheld electronic games produced by Nintendo from 1980 to 1991 . Created by game designer Gunpei Yokoi, each Game & Watch features a single game to be played on an LCD screen in addition to a clock, an alarm, or both . This console inspired Nintendo to make the Game Boy . It was the earliest Nintendo product to gain major success . </P> <P> In 1979, Gunpei Yokoi, traveling on a Shinkansen, saw a bored businessman playing with an LCD calculator by pressing the buttons . Yokoi then thought of an idea for a watch that doubled as a miniature game machine for killing time . </P>

Who invented the game & watch series of games
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