Sonic Reversi

Sonic Reversi is a mobile phone game released as part of the Sonic Cafe service offered by Sega. In this game, the player plays Reversi as Sonic against other well known characters such as Tails and Amy, with a practice match against a Chao available. The player plays for (and can lose) Rings, as well as national rankings via a high-score server. This game's sequel is Sonic Reversi Hyper.