|Pre-May 1993 Sonic arcade games|
According to former Sega president Al Nilsen in the May 1993 issue of Electronic Gaming Monthly there were 2 Sonic arcade games that were developed before the release of SegaSonic the Hedgehog. He states the reason the games went unreleased was due to them lacking the "special-ness" that Sega expected of Sonic games at the time. It is possible that he was referring to Waku Waku Sonic Patrol Car and UFO Mini: SegaSonic which were both released before May 1993 in Japan. Although it is more likely he was talking about SegaSonic Bros., an unreleased arcade game from 1992.