, 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 the 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.