Dr. Robotnik's Mean Bean Machine (Genesis)

Dr. Robotnik's Mean Bean Machine is a Westernized Puyo Puyo based on the syndicated cartoon Adventures of Sonic the Hedgehog.

Unused Stages
The Lesson Stages of Puyo Puyo are still present, and can be accessed via patch code (where  is a value from 00-02), although they're a bit glitchy: the tutorial text is scrambled, no music plays, Coconuts stands at odd positions in the stage intros, and Scratch takes the place of Skeleton-T as the challenger. The flashing squares showing which beans can be cleared with the current piece still remain, though. Beating the third Lesson Stage advances the player to the ending scene.

Sound Test


Normally, the game will stop you from playing if it is played on a Japanese Mega Drive. However, if you bypass this (for instance, by changing the region while running or using some sort of patch code), you will be rewarded with the ability to access the sound test in the Options screen. The Game Genie code will also make it appear.

Unused Music
Within the Sound Test are a few unused songs, mostly leftovers from Puyo Puyo:

Checksum Error


The checksum error screen from Puyo Puyo still exists in this game, and is still triggered in the same way.

Regional Differences
The Korean version changed the lockout screen to all capital letters, and corrected its "onry" typo to "only." Requiring Japanese region also made the internationally unused sound test (see above) a standard feature in Korea.

Revisional Differences
In the version included in Sonic Classics, the sound test does not appear when set to Japanese region.