Dr Robotnik's Mean Bean Machine - Game Gear - Puzzle

Okay, so this Dr. Robotnik guy, he decides to turn something else into robots. This time, it's the citizens of Beanville! It's up to you to save them from their doom. You drop pairs of beans into the dungeons, trying to create groups of four in matching colors. You must challenge Dr. Robotnik's robots to a battle and defeat them, and eventually face the Eggman himself.