began porting R&D1-developed arcade games to the Famicom, Shigeru Miyamoto lured him and SRD to R&D4 to help develop Excitebike.

Following the release of Excitebike, R&D4 developed a Famicom port of the beat 'em up arcade game Kung-Fu Master, called Spartan X in Japan and Kung Fu everywhere else. The game improved on features introduced in Donkey Kong, representing a key step in the life of the platform game