Dr. Robotnik has hatched a plan to ensure that no music or fun
remains on Mobius. To do this, he kidnaps the citizens of Beanville and
stuffs them into a giant robotising machine called the Mean
Bean-Steaming Machine, so that they become his robot slaves. The player
must now defeat each of the robot guards and Robotnik himself to foil
his evil plans.

In the game, a player must group 4 or more different colored beans
(or Puyos) together so that they erase, and send Refugee Beans (aka
Garbage, and Ojyama) to the opponent. The more beans that link up, the
more garbage is sent. Players may also activate step chains (aka Rensa)
so that even more garbage is scored. The game is decided when the third
column from the left is piled to the top.