Sonic Labyrinth for Game Gear was released on November 17, 1995 (Friday) in Japan.
TIPS AND TRICKS
* Stage Select:
At the title screen, press Up x2, Right x3, Down x6, Left x9. The world Select will appear. In the Config menu, the Stage option will replace the Sound option.
* Bonus stage:
At zone 2-3, find the cannon and hold Right+1+2. Turn on the button to open the door to the bonus stage.