Sonic Xtreme Box
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SegaSonic Bros., also referred to as Sonic Brothers, is an unreleased video game for the Sonic the Hedgehog series. It is a puzzle game featuring three different colored Sonics that was seemingly slated for a 1992 release.

The game was designed by Fukio Mitsuji, who is best known for creating the Bubble Bobble series of games.


SegaSonic Bros. is a falling-block puzzle game that features three different-colored Sonics as the falling pieces in sets of four. The Sonics can be rotated and will fall to the bottom, piling up. When Sonics of the same color surround a Sonic of other colors, it/they will disappear. This can be done by forming a ring around the Sonics or by trapping the Sonics against the wall and boxing them in with Sonics of a single color.

In single player, the game progresses through different Zones from Sonic the Hedgehog while Dr. Eggman sits in the center, operating a control panel. Clearing large sections of Sonics delivers electrical shocks of varying intensities to the doctor, sending him flying. Clearing enough Sonics spawns a Chaos Emerald, which clears every Sonic in the row that it lands in and every row above it. Once the player reaches Level 30, a white-colored Sonic joins to increase the difficulty. The game also features a multiplayer mode were two players compete against one another, winning by the other player topping out or after scoring 300,000 points.



  • This game was never released due to bad location testing in Japan and was considered lost until arcade board collector ShouTime revealed that he had a working board back in 2016.[1] It would not be until July 2018 when the game would become playable to the public for the first time at California Extreme 2018.
  • Interestingly, the music that plays during the Blue Spheres Special Stages in Sonic the Hedgehog 3 plays when the player reaches level 40 in SegaSonic Bros., two years before the latter was officially released in 1994.


SegaSonic Bros

SegaSonic Bros. Gameplay (Unreleased Arcade Game)-1


  1. 1.0 1.1 George (25 July 2018). Rare SegaSonic Bros. arcade prototype to be playable at California Extreme this weekend. Sega Bits. Retrieved on 31 July 2018.
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