In addition to the arcade game activity, Nintendo was testing the consumer handheld video game waters with the Game & Watch. The Game & Watch or G&W 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 and/or an alarm. It was the earliest Nintendo product to garner major success, with 43.4 million units sold worldwide.