SegaSonic Bros. is a Sonic the Hedgehog arcade puzzle game for Sega System C2 hardware, originally set for release in 1992. While "finished", the game failed its location test in Japan and subsequently did not see a nationwide release.

Unlike traditional matching puzzle games, SegaSonic Bros. has players creating lines and loops using the different colored Sonics. Creating a line can be done by connecting Sonics of the same color across, diagonal, above, and below one another. Pieces drop from the top of the board in groups of four, with the colors randomly mixing after each drop. The object is to eliminate as many pieces on the board at once as possible. A bonus is awarded when the entire board is cleared, which multiplies the score depending on how big of a combination was executed. At every ten levels, the player is awarded a Chaos Emerald. Once the Chaos Emerald lands on the board, it will eliminate everything above and on the same plane as it. The background and music also changes after every tenth level, going through each stage of Sonic the Hedgehog, including both backgrounds of the game's Special Stage.