SONIC THE HEDGEHOG -- Genesis
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Stage Select-
When the Title Screen comes up hold A, then press Up, Down,
Left, Right, then you will hear a chime.  Then hit START.
You can then start from any stage or test the sounds. If
this doesn't work, try the following method:  At the Title
Screen, press Up, Down, Left, Right, hold A, and press Start.
For some odd reason, some versions of Sonic require the first
method, some the second.  After doing this once, you only
need to hold down START and A to enter the stage select.

Get All Emeralds- 
This cheat allows you to start at the First Level 
with all the Emeralds, and with lots of Continues.  Use the Stage 
Select cheat (see above) to get to the Special Zone.  When you get the 
Emerald, and have entered into the First Zone, press RESET.  Use the 
Stage Select cheat to get to the Special Zone again.  When you get the 
next Emerald, and have entered the First Zone, press RESET again.  
When you finally have all the Emeralds DO NOT press RESET, just 
continue on with First Level. You get to keep the Emeralds and the 
Continues accumulated so far.

Control Mode-
At the Title Screen, press U, C, D, C, L, C, R.  Or, 
if that doesn't work, try this:  Quickly type 4 C press U, D, L, R 
repeatedly until you hear a chime.  This will give you special 
techniques during games: While paused, pressing A will reset the game, 
pressing B will allow you to play in slow-motion (while B is held 
down), and pressing C will advance the game one frame at a time.  

Debug Mode-
Enter Control Mode as described above.  Anytime after 
that, after pressing START to begin a game, hold down A (pressing 
start before A allows you to enter Debug Mode even if you've activated 
Level Select previously) until you see Sonic on the screen.  If you 
see a bunch of hex numbers on the top of the screen, you're in the 
mode.  To start "debugging," press B, then you can select any sprite 
in that stage and put it on the screen.  To select a different sprite, 
press A, and to place it on the screen, press C.  Note that sprite 
selection is different from Zone to Zone.  Also, instead of displaying 
the time elapsed, it displays the number of sprites currently on the 
screen.  Normal Control Mode functions work.  This only works on the 
first production releases of Sonic.

Confused Demo-
You can confuse Sonic during the demo by pressing 
all three action buttons repeatedly.  Sonic will 
lose his place in the pattern and possibly even die.