Super Sonic sign
Get all of the Chaos Emeralds and transform into Super Sonic. Try to have at least fifty rings when you finish the level. After completing the level, run off screen and wait until the end-of-level sign shows Sonic. When it does, transform into Super Sonic. The sign will show Super Sonic for one second, then show blue Sonic again.
Starry Super Sonic
Get all the Chaos Emeralds and collect fifty rings, but do not transform into Super Sonic yet. Find an invincibility monitor and spin (do not jump) into it. Then, transform into Super Sonic. If done correctly, the stars will surround Super Sonic until he runs out of rings and transforms back into blue Sonic. Note: This does not improve Super Sonic's performance
At the start of Angel Island, kill the monkey in the tree and jump on the first gray rock to reveal a bumper spring. Bounce up into the tree, and using the bumper spring hidden in the tree, bounce left to land on the moving platform. The platform will take you to a ring bonus and lightning shield power-up. Using the spring in the tree again, bounce right to land on ground with spikes and a RhinoBot. Jump past these to collect the fire shield. When this is collected, Sonic can use the fire dash attack by pressing [C]x2.
Bonus Stage (Gum Ball machine)
Enable the "Level Select/Sound Test" codes. If you try to select the "Bonus" option in that screen, you will find that it will not work. Instead, press [Start] on the third selection down from the "1P vs 2P" options. In Act 2 of that option, you will be taken to the bonus stage. To quit, pause and press [Start]. Note: After several tries on the bonus stage, the title may glitch and display "DOILUS STAGE" instead of "BONUS STAGE". If you quit after this happens, the sound test menu may go off the screen, and any options that were previously at the bottom of the screen will be at the top, and look out of place.
Easy special stage
Collect fifty or more rings to enter the special stage and hit the checkpoint marker.
While in the Death Egg, defeat the big robot, and enable the "Super Sonic", "Debug" and "Level select" codes. Start running out of the Death Egg. While running out, turn into an object, then back to Sonic. Go back to the robot room, and another robot will be there. The explosions that follow you out will follow you while you fight the robot. You can go back a few times using this technique.
Fiery Defeat in Death Egg
Enable the "Debug mode" code and make sure you can be Super Sonic. Gain enough rings so that you will be Super Sonic for quite some time. Defeat Metal Sonic and chase Robotnik and defeat him. When the Death Egg is exploding, and you are running down the shaft to exit, enter debug mode. Change back and run back inside. Robotnik will return and you can defeat him again, however you will be surrounded by fire. When you defeat him again, you will have twice the amount of fire behind when you run out. Note: when this is going on the game will be very slow and you will not actually see Sonic -- make sure you are still Super Sonic when executing this trick.
Enable the "Debug Mode" code. Press [B] + [C] during game play. Sonic will go mental, and dash about on the spot, turn upside down, and do other stunts. This can also be done with Tails.
For extra points, pass any zone in a certain amount of time. For the best bonus, enter the "Debug mode" code. The clock will stop and you will always score a 50,000 bonus.
Oil Ocean music
The following trick allows the Oil Ocean music to be heard during the entire game. Go to sound test selection in the options menu and listen to songs 1, 9, 9, 2, 1, 1, 2, 4 in that order. You should hear the Oil Ocean music. Then, hold [A] + [Start] to return to the Sega screen with the Oil Ocean music still playing.
Emerald Hill music
To hear the Emerald Hill melody at the title screen, go to sound test selection in the options menu and listen to songs 1, 1, 2 and 4 in order. Then, highlight "Player Select" and press [Start]. You will hear the Oil Ocean music at the beginning of the first level. Reset the game, and you will hear the Emerald Hill music.
Fast Casino Night music
Enable the "Debug mode" code. Go to Casino Night 1 or 2 with Tails. Find the Super Shoes but do not open it. Change into a coin and give it to Tails until you have 98 rings. Put at least two rings on top of the monitor and at least ten rings in the monitor. Change back into Sonic and hit the Super Shoes. You should hear the extra life music, followed by a very fast Casino Night theme.
No Boss music
Enable the "Level select" code and go to a Boss. Press [Start] then hold [B]. The game should now be in slow motion. When the Boss enters the screen, hit him, then release [B]. The game should pause. Press [Start] and the Boss music will stop.
Super Sonic music when playing as Sonic
Enable the "Debug", "Level select", and "Super Sonic" codes. Go to Casino Night Zone and turn into Super Sonic. Run into the strange Bumper Bug that you normally cannot destroy to lose all you rings and become regular Sonic. Instead of the Casino Music playing, the Super Sonic music will still be play.
Chemical Plant: Extra lives
Insert the Sonic The Hedgehog 2
cartridge into the Sonic And Knuckles
cartridge. Play until reaching Chemical Plant Act 1, where you get to the wall with the Spiny Badnik and the warp tube on the floor. Break open the tube and go through it. When you come out you will see a Ring Box next to a tower. Climb up the tower and on the top you will find an extra life. Glide left and you will find another extra life. Glide to the left one more time and you will find yet one more extra life. Since you will not want to go through the level again just glide to the right until you get to the tower you started from. Get on that first tower and glide to the right. The Act will be over and you will have three more lives.
When playing as Knuckles, at Chemical Plant Zone 2, make sure that you have between 90 and 99 rings. When you come to a part with a starpost, a spider, and a 10 rings television, hit the starpost. Then, hit the television. You now have over 100 rings and an extra life. Proceed, and go down to the acid. To the right, should find a 1-Up television. Get it, and jump right. You will eventually die, and have a bonus life. Repeat this process to get 99 lives.
Near the end of Chemical Plant, Act 2, Sonic will roll down a hill, and zoom up to collect two columns of rings. This trick will work if he gets high enough and gets on the higher platform. If not, he will fall to the lower path, hit the lamppost, and continue the level normally. After Sonic passes the moving blocks (that resemble four orange square blocks), there will be two spinning wheels which makes Sonic accelerate quickly. Avoid that. Go a short distance down the path, then run back and jump into the wall. If successful, Sonic will end up in a secret path containing many rings and a life. At the end of the path, Sonic will fall down and end up next to the Boss.
Death Egg Zone: Rings
Enable the "Level select" and "Debug" codes. Go to the Death Egg zone, turn your self into a ring, and press [C] to multiply yourself. Then, turn back into Sonic and collect the rings. This should keep you from dying for awhile.
Emerald Hill shortcut
Insert the Sonic The Hedgehog 2
cartridge into the Sonic And Knuckles
cartridge. To quickly get through Emerald Hill 1 and 2, play as Knuckles. Climb as high as you can and glide to the right to reach the end of the level within seconds.
Oil Ocean Zone Act 2: Hyper Sonic
Enable the "Debug mode" code. Enter Oil Ocean Zone. Allow Sonic to go in a balloon. When the balloon shoots out left or right to another balloon, quickly press [B] to enable Debug mode and go onto a platform. Press [B] again to return back to Sonic. Sonic will be "Hyper Sonic". This trick works even in Act 1. Moreover, if you enable the "Super Sonic" code and collect 50 Rings, Sonic will be the real Hyper Sonic (being invincible to add it on).
Wing Fortress shortcut
In Wing Fortress, move with some rings as far to the right as possible without climbing. When blades appear to block your way, hit them. As soon as you are invincible, walk through them. Jump on the platforms to the right and half the level will be completed.
Defeating Boss 1
First, hit him a few times. He will then shoot his drill out of his car. Be careful, as he goes from the side of the screen and also does the drill. Hit him one more time and he is defeated.
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.
Enable the "Debug mode" code and start a game with Sonic and Tails. Once in any level, turn into any enemy that you can destroy from above. Jump, then enable the "Debug mode" code. Tails should constantly be jumping. Put a lot of enemies underneath him. In about five minutes you will have about 80 to 100 lives, Remember, only put enemies underneath Tails.
Enable the "Debug mode" code. Make the clock stop and get 50,000 points for a free life. Repeat this as many times as needed.
Enable the "Level select" and "Debug mode" codes. Select one of the Emerald Hill zones. When you start the level, press [B] to turn into a ring. Press [A]x4 to become four rings in a row going up or down. Then hold [C] + [Right] for approximately five seconds. You will return to the beginning. Keep pressing [A] until you are at the top of a waterfall. You may not see your character, but you still will be there. Hold [C] + [Right] for approximately five seconds. Finally press [B] to turn Sonic green.
Object with cloud
Enable the "Debug mode" code, then duck and spin. While still spinning, turn into an object. It will still have the dust cloud behind it.
Enable the "Debug mode" code and hit a shield. Place a teleport box down and hit that. Tails will have a permanent shield.
Enable the "Level select" and "Debug mode" codes. Go to the Sky Chase level. Use debug mode to create a transfer box and break it open. When you hear Sonic die, press [B] to enter debug mode again. Move the pointer up until you see Tails and exit debug mode. Then, jump to have two Tails.
Play at the end of a level
Enable the "Debug mode" code. At the end of the first Aquatic Ruins level, press [B] and change into one of the drill enemies. Place him all over the screen. You must do this before you hit the sign. Hit the Sonic sign and complete the level. Then, press [B] to change into an object and fly above a drill enemy. Press [B] again and drop onto an enemy. You will die while your points are being added up, but the game will continue as if you had completed the level. The next screen will say you are in Aquatic Ruin part two, but you will start on the last screen of the first part of that level, and you can play freely in that area until you hit the sign.
Easy level win
Enable debug mode and create an object that resembles a square made of machinery. Place Sonic above this and drop him.
Easy ring capture
Enable the "Debug mode" code. Make sure you have game set to Sonic and Tails. Go to desired level. Transform into a ring and stop in front of Tails. Keep pressing [C], and every ring you create Tails will collect. Note: The maximum amount of rings that can be collected is 999.
Fun way to get Emeralds
Enable the "Debug mode" code and place seven checkpoints in a row. Then, turn yourself into a Ring. Place 50 or more on Tails. Turn back into Sonic. Then, jump in the stars.
Black background and see-through bushes
Enable the "Level select" code. Choose any level (the first level works best) and begin game play. Press [Start], [C] during game play and the background will turn black and you will be able to see through the bushes you pass.
Enable the "Debug mode" code. Put two horizontal springs, one in each direction slightly close. In between them, the level will shake.
Glitch: Run in mid-air
Enable the "Level select" and "Super Sonic" codes, then collect 50 rings in any Boss level. Have over 70 rings after you break the robotisizer (the big capsule at the end of each Boss level). Jump to become Super and run in the air.
Glitch: Move in background
Activate the "Debug mode" code. When Sonic or Super Sonic is skydiving off the Death Egg, turn into an object then turn back. You should be able to move a small distance in the air. When Sonic or Super Sonic flies at the screen, you will be able to move in the background for a small amount of time.
Glitch: Tails runs in the background
In Aquatic Ruins Act 3 with a second controller, when you defeat the Boss have Tails remain on a pillar. Have Sonic run forward and hit the capsule at the end of the level. Tails will be running in the background.
Glitch: Spin forever
In Aquatic Ruin 1, go to the first rising pillar. Do not break it. If you did, go all the way left, then return. Spin Dash to break the pillar. The pillar does not break, but Sonic will still spin.
Glitch: No music
Enable the "Debug mode" code. In a water level such as Chemical Plant 2 or Aquatic Ruin, debug yourself when you are in the water. Then, go out of the water but do not revert back to Sonic. Wait until you hear the drowning countdown, then revert back to Sonic. The countdown will continue, and it will soon stop. The music will stop playing. Note: If Sonic returns to the water, the music will return. There are some other things you can do with this glitch. Even if Sonic hits the stars box, the music will still not play. However if Sonic will transform into Super Sonic, the music will begin playing again. If you kept debug mode on when the countdown stops, then revert, then debug, the screen will freeze, but Sonic is able to leave the screen. To return to normal, Sonic has to get out. If Sonic goes to the Boss, the music will play once again. However, if Sonic returns to the water and lets the countdown music start, then gets out, the music will stop playing again. To get water in Aquatic Ruin by the Boss, Sonic must be in the water, until he reaches the far right of the screen. The screen will pull up, and Sonic must go to the top of the screen. The same thing happens by Chemical Plant. Once Sonic defeats the Boss, the music will return as the normal music of the level. However if Sonic goes back into the water, the Boss music will return.
Glitch: Strange ending
Enable debug mode and turn into a grounder in World 2 Act 1. Fly across the level and finish. Return to normal form after crossing the flag. The flag will look very strange.
Glitch: Strange graphics
Enable debug mode, then on either Aquatic Ruin Zone place six transfer boxes close enough to each other so you can hit them all at the same time. Leaves should now run through the center of the screen and the background should look strange.
Glitch: Yellow Sonic
While playing as Super Sonic, fall off the screen. As soon as Sonic dies, press [B] and return to solid ground. Sonic will remain yellow as long as you have rings, but he will have no powers. To get his powers back, get hit then get 50 more rings and transform.
Glitch: Death Egg Zone
Enable the "Level select", "Debug mode", and "Super Sonic" codes. Enter Death Egg Zone. Bring Sonic into the first room, but not all the way. Sonic should still see the hallway behind him. Create two teleport boxes. Create 50 Rings and collect them. Jump on one box and the screen will transport. Move to the right and Sonic will be in the room completely, and Metal Sonic will come down. Jump on the last teleport box and Sonic will revert back in the front of the room. He will once again see the hallway behind him. If Sonic goes past this room he will chase Dr. Robotnik and go into the next room. Sonic can continue down past the room, down the hallway, and reach the end. If Sonic touches the floor of the black background, he will get out. You can also do the following additional things:
Debug yourself to the far right by the black background (one does not have to touch the wall). The robot will slam onto you and hit the air as if it was slamming onto the floor. Glitch: Ending
Bring Sonic back to the Metal Sonic room (if Metal Sonic is still there). Debug yourself, and the robot will slam into the Metal Sonic room (which makes two Bosses in the same room).
Keep returning to the place where you chase Dr. Robotnik, and you will bring many of the big robots.
After you defeat Death Egg, there will be a slide show with four pictures of Tails, then you see Sonic falling. Debug yourself, and put Sonic at the bottom of the screen. Exit Debug mode. Sonic will get out. The screen returns back to the slide show.