Here are some cheats and tips for the game Sonic The Hedgehog.
Level select:
Press Up, Down, Left, Right at
the title screen. A chime will confirm correct code entry. Hold
A + Start to begin game play.
All Chaos Emeralds:
Enable the “Level select” code. Select the “Bonus
level” option on the level selection screen. Obtain the Chaos
Emerald, reset the game, and repeat the process until all of them
are in your possession. Allow the game to continue after obtaining
the last Chaos Emerald to start in the Green Hill Zone.
Debug mode:
Press Up, C, Down, C, Left,
C, Right, C, Start, then hold A
at the title screen. Continue to hold A until game play
begins. Screen coordinates will appear instead of a score and
the number of objects displayed will appear instead of the time
remaining. Use one of the following controller actions to enable
the corresponding debug code. Note: This code may only be enabled
on the first version of the game.
Object transformation
Press B during game play to change Sonic into a game
object. Press A to change into a new object. Press C
to place an object on the screen. Press B again to revert
back to Sonic. Note: The type of object that may be selectable
will vary from level to level.
Invincibility
Sonic is, by default, invincible in debug mode.
Slow motion
Pause game play and hold B.
Restart
Pause game play and press A.
Frame advance
Pause game play and press C.
Crazy Sonic:
Hold A + B + C during demonstration mode
for force Sonic to run into objects and act strangely. Note: This
may also be done during the ending sequence after completing the
Final Zone.
Bonus points:
Complete Green Hill Zone 1-1 or 1-2 in 29 seconds or less
to receive 50,000 bonus points.
Unlimited lives:
Collect the extra life at the very bottom of Green Hill Zone
– Act 3. Accumulate 100 rings to obtain another extra life. Collect
a third extra life located at the top of the loop-the-loop. Intentionally
lose a life and repeat the process.