Year 1979, Gunpei Yokoi from Nintendo saw a bored stiff businessman playing with his calculator on his daily journey to work by train. This ordinary observation led to the discovery of simple devices capable of displaying one game – Game&Watch. https://www.eurogamer.dk/articles/2014-04-24-historien-om-nintendo-del-1-begyndelsen Their successor is the most recognizable and successful line of handheld consoles of the last century, released in 1989 - GameBoy. The p roduct at that time had many groundbreaking features. First of all, the games were stored on cartridges, which were easily replaceable. Secondly, Nintendo thought outside the box, they didn’t target only customers, but also game developers. Great software development kit ensured diversity of games. We owe to this decision such classics like Pokemon. https://picclick.it/Pokemon-Rojo-Fuego-Nintendo-Game-Boy-Advanced-163435499144.html http://www.wikiwand.com/en/List_of_best-selling_Game_Boy_video_