This page has info taken from Sonic Retro.
SegaSonic Bros. is a cancelled and lost puzzle game set for release in March 1, 1992. The game was set for release in arcades. The game was cancelled due to the fact that it failed in it's test location. It was designed by Fukio Mitsuji, creator of Bubble Bobble.
The game featured 2 recolored versions of Sonic, one red and one yellow, as well as the normal blue Sonic.
In December 2018, the ROM was found and gameplay was directly recorded. The ROM has been dumped since and is available for download. It's a prototype ROM of the game.