GP World (ＧＰワールド) is a Laserdisc-based racing game developed and published by Sega for a custom-built arcade system in 1984. It was "ported" to the SG-1000 in 1985.
GP World uses a third person perspective similar to the likes of Turbo, and sees the player race in a formula one car across various tracks. It is also notable for having a track editor. It is likely that the SH-400 controller was designed with this game in mind.