Gunpei Yokoi , sometimes transliterated as Gumpei Yokoi, was a Japanese toy maker and video game designer. As a long-time Nintendo employee, he was best known as the original designer of several notable Nintendo products, including the Ultra Hand toy, the Game & Watch and Game Boy handheld game systems, as well as the producer of a few critically acclaimed franchises such as Donkey Kong, Metroid, and Kid Icarus. The modern Nintendo philosophy called the "Blue Ocean Theory," or focusing on interactive gameplay with black-and-white graphics over cutting-edge technology was espoused by Yokoi and still applied today.