, also romanized as Gumpei Yokoi, was a video game designer for Nintendo. He created the Game Boy and the produced the "Metroid" series of video games. He was also a mentor to Shigeru Miyamoto. Yokoi's last invention, the Virtual Boy, was not a success. He left Nintendo and started a company called Koto Laboratory. His main product idea at this company was the WonderSwan, which came out in 1999, two years after he died.