Sonic The Hedgehog 3

Manage to beat a stage at with your time at exactly 9:59 and you'll net yourself an easy 100000 points.

To do this, you must have a copy of Sonic the Hedgehog 2. activate sonic 2's level select (sound test: 19, 65, 9, 17)
Now, without turning the system off, remove the cartidge, and insert the Sonic 3 Cartridge. Reset the Genesis console, keeping the A button held down at all times. On the title screen, press down untill you see sound test.
Success! you now have an easy (but different) way to access the level select and sound test!

If you are afrade of this damaging your games, please, don't try it. I have never had any game be damaged by this trick.

BONUS: If you look at the level Icons, you will see the icons from sonic 2. If you look carefully, you will see the Icon for Hidden Palace Zone, a level that was "removed" from Sonic 2!

Enable the "Level select" code. Highlight the "Special Stage" level and press C + Start. Collect the emerald, press A + Start, and repeat the procedure to collect all the emeralds.

Alternately, enable the "Level Select" code and go to "Sound Test". In the level selection menu, play the following songs in order: 1, 2, 4, 5, 6. If done correctly, The Chaos Emerald sound will play. Highlight a level and press Start to begin game play. Obtain 50 rings, jump, and press Jump again while in the air to become Super Sonic.

Enable the "Level select" code. Enter the sound test screen and play song 01 and 0F.Highlight level 2, hold A and press Start.

Enable the "Debug mode" code. Go to the first level in the stage selection screen and keep playing until you get enough points to go to the gumball machine bonus level. After you start, press B to enable debug mode. Press A until you turn into a red spring. Press C to make springs all along the gap in the center. Next, press B again to turn back into Sonic and you will extra power-ups. When finished, use debug mode to transport you under the springs, where you will go back to the level. Note: It is a lot easier if the bouncers on the wall are most all used up.

Enable the "Level Select" code. Hold A, then press Start when selecting the desired level. Press B to change into an object in the level, C to copy that object, and A to change the object.

Set off the first alarm on the first level of the Launch Base Zone. Wait in the middle of the alarm and perform Spin-Dash attacks on the Flybots. The value of the Flybots will eventually increase to 10,000 points as they continue to attack. Accumulate points and lives at this location.

Enable the "Debug mode" code and start a game with Sonic and Tails. Press Down + Jump (Spin Dash) then press B to turn into an object. Turn into an enemy and place him on Tails. He will still be Spin Dashing. Your points will soon double and you will get lives every second, or depending how fast, you place the enemy by pressing C. Once you have enough lives, turn back into Sonic by pressing B again. This is much faster than setting the alarm off in Launch Base Zone. Note: This works with any other Sonic game that has debug mode. More compact enemies work better than the larger ones. For example, in Aquatic Ruin, the Fly is much more efficient than the Grounders.

When playing a level after enabling the level select cheat, pause the game, then press the C button to advance the game by one frame.

This can be done with any character. Stand when you are in any zone and wait until the time reaches 9:59. You will die, then hear the game over music. Note: The game will not actually over -- you will only lose one life and it will say time over. Do not do this in water or you will drown.

In Hydrocity Act 2, become Super Sonic just before the door closes to the Boss room. Then, race toward the right without stopping. If done correctly, you should see a glitched capsule using Robotnik's graphics. Jump on the button to end the level. The graphics that are normally blue in the graphics will now flash like Super Sonic, and after they leave Sonic continues to stand there waving his finger until time runs out. If you listen, you can here Robotnik still going through his routine because the game thinks you are facing the Boss, which is why the level never ends. Sonic cannot move due to a separate glitch that disables him if he is super after the level ends.