Chop most of the voice samples off the arcade version to get the Genesis Puyo Puyo. Hooray for nearly-compatible hardware!

To do: See if any sound effects are unused (very likely). Harpy's sprite data is duplicated in the ROM; the second copy is byte-for-byte identical to the copy that is used (in the ROM, ergo in its compressed form as well as uncompressed). Re-discover what address this data is at; point to the one in Mean Bean Machine.

Unused Graphic

"Insert Coin(s)" text in the sprite set for the title screen. Makes sense, given how easy this was to port.

Sound Test

A sound test can be accessed from the Options screen in one of two ways:

• Beat the game once.


• Press A, A, Left, B, B, Left, C, C at the title screen (a chime will played if entered correctly).

Although the game is region free, if the region is not Japanese then you will not get the sound test menu show up in the options (おぷしょん, yes it says Opushon in hiragana) menu, although the chime will still play after the button presses above.

Not much is here; you can play up to three sound effects, although these are not on separate sound channels so they will stop other sound effects playing plus a song and one of the game's three voice samples.

The commands do the following

• F1 - All Clear, F2 - Clear - Seem to do the same thing and stop everything that is playing.


• F3 - Fades Out - Fades out sound effect or music, although the tune still plays.


• F4 - Fade In - Fades in sound effect or music, if music or sound effect has been stopped it will fade in from the start.


• F5 - Rebirth - If music has be stopped with Clear then nothing happens, else replays music or sound effect that has been faded out.


• F6 - Pause On - Pauses music or sound effect, although other commands can be executed whilst paused. (i..e F3, F6, F4, F7 will have already faded the music in).


• F7 - Pause Off - Starts music or sound effect again.

Music 0E (Warning of Puyo Puyo) is programmed to play the tune a semitone higher after each pattern, it will play so high that only the drums are left before it loops around and plays out of key.

Unused Music

Interestingly, the Mega Drive version has one song that is both not in the arcade version and is unused in the port called Rejection of Puyopuyo. This song, like many of the others in the game, comes from Madou Monogatari 1-2-3 (specifically 3, in the intro when Arle runs away from Minotauros).

Checksum Error

This simple warning screen is displayed for a few seconds at boot if the game's ROM checksum fails, and may be a holdover from the arcade version (most arcade games feature similar ROM/RAM checks to aid operators in troubleshooting).