On which video game system were Segaworld and Yokohama-based Joypolis park based?
SegaWorld: SegaWorld and Sega Park are names referring to one of a number of theme parks and arcades worldwide, including installations in the United Kingdom, China, Australia and Japan and owned and operated by Sega. SegaWorld:  The parks sought to promote Sega games while providing entertainment based on its licenses, while the Japanese Sonictown in a Joypolis park, created an entire world based on Sonic the Hedgehog alone. Joypolis: Joypolis ( "Joiporisu") is an amusement park chain that was first opened on July 20, 1994 in Yokohama, Japan.
Sega