Founded in 1970, Research and Development 1 was the oldest development team of Nintendo. It was initially headed by Gunpei Yokoi. The team developed, among others, notable console games, including key Metroid and Donkey Kong installments. In 1989 they release the GameBoy handheld and afterwards continued to work on many games developed for that system. R&D1 also created the Wario spin-off franchise.