This is one of many Genesis games that were recently released for online play only in Japan by Sega using their online buy and play Emulator service; this game, among others, was recently dumped by Sonic Cult. Surprisingly, this isn’t a Columns or Puyo Puyo clone! You earn points by joining two tiles that have the same design. And you move them around using the pad and the buttons. And that’s it. There isn’t much in the game department.
Except that you get to play as Sonic, against Sonic! Isn’t that neat?! I know, it isn’t. Oh, and most of the music really sucks. At least the game includes some instructions… if you can read Japanese…