Puyo Puyo/Hidden content
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Contents
Mega Drive version
Sound test
On the title screen, press 
. A sound will signal the code has been entered correctly, and a "sound test" option will appear in the options menu.
This feature can be unlocked legitimately by beating the game on any difficulty.
Game Gear version
Sega logo ™ symbol
While not released outside Japan, code exists to add the ™ symbol to the introductory Sega logo if the game detects it is being played on a Western system.
References
