SegaSonic Bros. was developed for Sega System C2 and was originally set for release in 1992. However, the game failed its location test in Japan and subsequently did not see a nationwide release. Its existence wasn't known about for the best part of 25 years, save for a couple of overlooked posts on Twitter from 2014 and a few posts by Custom Robo developer Kohji Kenjoh on SEGA's social media website it-tells from late 2013. It only came to public attention in early 2016 when a working board was found by arcade board collector ShouTime.
|Sonic games for the following systems|
| 1991 Waku Waku Sonic Patrol Car 1993 Sonic the Hedgehog | SegaSonic Cosmo Fighter Galaxy Patrol | Sonic the Hedgehog 2 | SegaSonic the Hedgehog 1996 Sonic the Fighters 2011 Sonic & Sega All-Stars Racing |
Prototypes SegaSonic the Hedgehog (revision A)
|1992 UFO Mini: SegaSonic 1993 Sonic the Hedgehog | SegaSonic Popcorn Shop 1994 Sonic's Space Tours 1997 Sonic the Hedgehog AWP 2002 Sonic & Tails Spinner 2003 CR Sonic 2007 Sonic Spinner 2008 Sonic Live!|
|Unreleased Sonic the Hedgehog Games|
Sonic's Edusoft (Master System)
Sonic Sports (Sega 32X)