The game is set on the planet Mobius, which is inhabited by bean-like creatures. Doctor Robotnik conceives of a plan to bring terror to the world by kidnapping the citizens of Beanville and turning them into robot slaves, and eventually creating an army that will help him rid the planet of fun and joy.
To achieve this, he creates the “Mean Bean-Steaming Machine” in order to transform the bean-like creatures into robots. Putting his plan into motion, Robotnik sends out his Henchbots to gather all the bean-like creatures and group them together in dark dungeons so they can be sent to the Mean Bean-Steaming Machine.
The rest of the game’s story revolves around the player character, “Has Bean”, and their journey to stop Robotnik’s henchmen by breaking into the dungeons and freeing the bean-like creatures.
Dr. Robotnik’s Mean Bean Machine is a version of Puyo Puyo with a storyline involving characters from the Sonic the Hedgehog games.
The evil Dr. Robotnik decides to turn the citizens of Beanville into robots. It’s up to the player to save them from their doom. The player drops pairs of beans into the dungeons, trying to create groups of four in matching colors.
He or she must challenge Dr. Robotnik’s robots to a battle and defeat them, and eventually face the Eggman himself.