is an
isometric platform game in the
Sonic the Hedgehog series, released by
Sega for
arcades in 1993. The game supported three players playing simultaneously, and possessed a unique
track ball set up for moving on-screen characters. The only other control input was a single button, allowing the player to perform a jumping attack. The use of the trackball has subsequently led to great difficulty in emulation efforts, with
Yuji Naka stating it as the reason for it not being included on future compilations or rereleases, such as
Sonic Gems Collection.