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When the Sega logo comes up, just after the "Sega" theme is sung and the screen begins to turn black, quickly press: Up, Up, Down, Down, Up, Up, Up, Up to the beat of the drums. You should hear a ring chime if you did it correctly. A new Sound Test option should appear at the title screen.
Debug Mode:
Enter the Level Select code, then press A + Start
to choose your
starting level. Once the action starts, press B to
change into an
item, A to cycle between the available items, and C
to place an item.
Alternatively, turn on the Genesis and press Up,
Up, Down, Down, Up,
Up Up before Sonic gets fully on screen.
Easy Emeralds:
To gain all the chaos emeralds, enter the Level
Select code, then
highlight "Special Stage" and press C + Start. After
receiving the
emerald, press A + Start and repeat the process
until you have them all.
Alternatively, enter the Sound Test code and play
sounds 2, 4, 5, 6
in order. If you did it correctly, the Emerald sound
will play.
Extra Lives in Launch Base Zone:
To do this trick you must get to the first level of the
Launch Base
Zone. Set off the first alarm, stop Sonic in the
middle of it, and
do a Spin-Dash attack. The flybots will continue to
attack, and
eventually their value will increase to 10,000 points!
Every five
flybots will gain you a life and, if you're patient
enough, you can
earn up to 99 lives!
Nightime Play:
Enter the Level Select code, then press C + Start
to choose your starting level.