Dr. Robotnik's Mean Bean Machine/Hidden content
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If playing the game on a Japanese Mega Drive via patch code or a region switch hardware mod, a sound test will be available in the Options screen. The Game Genie code ADTT-AAAE will also make it appear but will trigger a checksum error if it is enabled before the Sega logo screen.
Some of the songs in the sound test (specifically, 01, 0C, 0D, 0F, 10, 14, and 15) are hidden if the console region is set back to US. However, if the console region is still set to Japan, these tracks will get shown after the normally accessible tracks.
Bypass region lockout
When playing on an incorrect region system, the lockout screen can be bypassed by pressing on Controller 2. This code can only be attempted once; if a mistake is made, the system must be reset in order to try again.
Expectedly, there are multiple leftover graphical elements of the original Puyo Puyo game inside the game's memory (note: the sprite's original palettes from Puyo Puyo are used since the modified game does not feature matching ones):
|The cutscene sprites of the player character, Arle Nadja are mostly intact. They are still loaded with the cutscene unmodified, suggesting there were no plans in production stages for Sonic or any other player character to be utilised in Dr Robotnik's Mean Bean Machine.|
|The full tile set for the Lesson Mode arena is still inside the game (parts being utilised for the background of the Options screen and the Checksum Error message above). Curiously Lesson Mode itself does not load the area, implying it underwent some modification before being omitted altogether.|
|Some leftover tiles from the original high score screen.|
There are a few unused songs and sound effects (mostly leftover from Puyo Puyo) and can be heard in the sound test.
|01||A rendition of Kraftwerk's "Home Computer" that was removed for licensing reasons. This was originally the title screen music in an earlier build.|
|0C||Stage Clear jingle from Puyo Puyo.|
|0F||Brave of Puyo Puyo. A remix of this is used in-game but this is the original arrangement.|
|10||Theme of Puyo Puyo. A remix of this plays over the credits, but this is the original arrangement.|
|14||Unknown. Perhaps a alternate warning music for the final stage.|
|15||A very weird sound.|
The Lesson stages from Puyo Puyo were not cut from the game and can be accessed by using PAR code 00BEFE:000? (? can be changed to 0-2). The tutorial text is glitchy and no music plays. Coconuts stands in strange positions in the stage cutscenes. Defeating the third Lesson stage advances the player to the ending cutscene.
Cheat device codes
These are cheat codes that can only be used with game enhancer devices. Support for these codes is available in most emulators.
|ALNT-AA66||Refugee beans are disabled.|
|VWNT-AAHE||Refugee beans come in smaller amounts.|
|ERNT-AAHE and/or C8NT-AAHE||Refugee beans come in larger amounts.|
|AW9A-AAH8||Start on Scenario mode Stage 2.|
|A09A-AAH8||Start on Scenario mode Stage 3.|
|A49A-AAH8||Start on Scenario mode Stage 4.|
|A89A-AAH8||Start on Scenario mode Stage 5.|
|BC9A-AAH8||Start on Scenario mode Stage 6.|
|BG9A-AAH8||Start on Scenario mode Stage 7.|
|BL9A-AAH8||Start on Scenario mode Stage 8.|
|BR9A-AAH8||Start on Scenario mode Stage 9.|
|BW9A-AAH8||Start on Scenario mode Stage 10.|
|B09A-AAH8||Start on Scenario mode Stage 11.|
|B49A-AAH8||Start on Scenario mode Stage 12.|
|B89A-AAH8||Start on Scenario mode Stage 13.|
|ALNT-AA66||Refugee Beans Are Disabled.|
|CBNT-AAHE||Refugee Beans Come In Gargantuan Amounts.|
|VWNT-AAHE||Refugee Beans Come In Smaller Amounts.|
|ADTT-AAAE||Unlock sound test.|
|FFE166:??||Player 1 - Falling Bean Color Modifier (Bottom Bean)|
|FFE167:??||Player 1 - Falling Bean Color Modifier (Top Bean)
|FFE226:??||Player 2 - Falling Bean Color Modifier (Bottom Bean)|
|FFE227:??||Player 2 - Falling Bean Color Modifier (Top Bean)|
|Dr. Robotnik's Mean Bean Machine (16-bit)|