Dr. Robotnik's Mean Bean Machine

Dr. Robotnik's Mean Bean Machine is a Sonic the Hedgehog video game. The game is a modified version of the Japanese puzzle game Puyo Puyo. Unlike other games in the series, it takes place in the same universe as the Adventures of Sonic the Hedgehog cartoon.
The game is played with two opponents trying to connect as many chains of four or more similarly colored beans as possible in a large grid. As higher chains are achieved, Refugee Beans are sent to the other side. This can only be removed when a neighboring group of beans is matched. The winner is the one whose beans do not reach the top of the grid. There are various modes that allow players to battle each other in various difficulty settings. These determine speed, the initial number of Refugee Beans, and other various things.

Tails Adventure

Tails Adventure, known in Japan as Tails Adventures is a videogame developed by Aspect and distributed by Sega in 1995 for the videogame console Sega Game Gear. It is the first game of the Sonic series to mix platforming and role-playing game elements. It was the second and last game in which Tails is without Sonic, although it is the first that was not only released in Japan. The game does not follow the plotline of other games in the Sonic series, and the game's plot is different in the Japanese and Western versions of the game. It is a prequel to the series starred by Tails in the Japanese version. Basically, Tails must save an island from a threat, getting objects and Chaos Emeralds that he obtains during his passage. It has since been rereleased on Sonic Gems Collection.

Knuckles' Chaotix

Knuckles' Chaotix, in Japan called simply Chaotix, is a platform game in the Sonic the Hedgehog series, developed by the Sonic Team and published by Sega for the Sega 32X. The game was released in North America in March 1995, in Japan on April 21, 1995 and finally in Europe during May 1995. Despite demand from fans, the game's only "re-release" has been through Gametap's PC service.[1] It was originally going to be in Sonic Gems Collection but it was not included for unknown reasons-however, an entire section of the museum area of Gems collection is dedicated to this game. It is the only Sonic-related game to be released for the Sega 32X and its stand out features include its 2D sprite-based graphics and simultaneous two-player gameplay.