Sonic the Hedgehog 2 (Mega Drive)

Level select:

Use the sound test selection on the options menu. Choose
sounds 19, 65, 9, and 17 (in that order) and press C after
each selection. A chime will confirm correct code entry. Press
Start. Hold A and press Start at the title
screen.

*Toggle Tails or Miles:

Press Up(3), Down(3), Up at the
title screen. A sound will confirm correct code entry.

*Extra continues:

Enable the "Level select" code. Use the sound
test selection on the options screen. Choose sounds 1, 1, 2, and
4 (In that order) and press C after each selection. Highlight
the "Player Select" option and press Start.

*Super Sonic and Tails:

Enable the "Level select" code. Use the sound
test selection on the options screen. Choose sounds 4, 1, 2 and
6 (in that order) and press C after each selection. Music
will confirm correct code entry. Select any starting level and
collect 50 rings. Sonic or Tails will turn yellow and can run
at super speed, jump twice as far, and become invincible to enemies
and spikes. The total number of rings will decrease during super
mode. Your character will revert to normal when the ring total
reaches zero. Note: Super Sonic or Tails can still drown, be crushed,
and fall into bottomless pits.

Alternatively, enable the "Level select" code. Then,
press Start and hold A. Press Start when
the title screen appears. Then, play songs 1, 9, 9, 2, 1, 1, 2,
4 to activate debug mode. Then play 3, 4, 1, 2, 6. Create 50 rings
in debug mode. Jump, make a item box as Super Sonic, and jump
on it. Get hit and change back into Super Sonic.


*Hyper Sonic:

Run forward in Oil Ocean, Act 2 until reaching the
green jet springs. Jump on the very last spring and hold Right.
Sonic will hit a group of spikes before becoming stuck in the
side of the wall. Jump out to transform into Hyper Sonic. In this
mode, Sonic can run faster and jump farther than Super Sonic,
but is not invincible.

*Mega Sonic:

Collect fifty rings and jump after becoming Hyper Sonic
for even more speed and higher jumps.

*Debug mode:

Enable the "Level select" code. Use the sound
test selection on the options screen. Choose sounds 1, 9, 9, 2,
1, 1, 2, 4 (in that order) and press C after each selection.
A chime will confirm correct code entry. Select any starting level,
then hold A + Start 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 when playing as Tails
alone.

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.


Night mode

Hold C and press Start when selecting a level.


Super Tails

Place a transfer box monitor on the screen. Hit the monitor
as Super Sonic.


*Easy Chaos Emeralds:

Begin normal game play and collect a Chaos Emerald.
Reset and begin game play again from the options menu.

*All Chaos Emeralds:

Enable the "Level select" code. Play songs
4, 1, 2, 6, get 50 rings, and jump.
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