6 Manufacturer : Nintendo Year of Release : 1980 Units sold : 43.4 million Best-selling game : Donkey Kong Created by game designer Gunpei Yokoi, Game and Watch (GW) features a game in addition to a clock, an alarm, or both. It was the earliest Nintendo product to gamer major succes. 59 GW games were released and one only available as a contest prize. Mr GW is a character often considered as the mascot of the GW series.