Made in Wario, as the game is known in Japanese, was originally made secretly by several developers on the development team Nintendo R&D1 without telling their manager at the time. The people came up with the idea of using Wario for the game, since they could not think of anyone else who would be best for the game. According to them, Wario is "always doing stupid things" and is "really idiotic", so they used him and the other newly created characters, who have become a recurring cast in the series