Sonic the Hedgehog 3
When the "SEGA" screen fades, quickly press Up-up-down-down-up-up-up-up. If you have done this right, you should be able to scroll down to "Sound Test" below "Competition". The ups and downs are very difficult in the short amount of time provided, but with practice, it is pretty easy.
Contributed By: Houston_dude.
Enter the following code in any stage while Debug Mode is entered
|Hold B and press C||Your character will show you all of his sprite animations|
|Hold B and press C again||Your character will stop the sprite show if it is activated|
Contributed By: Numbuh 128bit.
Sonic and Knuckles Mini-Boss Music
Make your way to the end of Act 1 of Hydrocity Zone (Zone 2). When facing the mini-boss, keep yourself underwater until the water warning music plays. Then jump out of the water.
The game should now be playing the mini-boss music from Sonic and Knuckles, which wasn't out at the time (the music was evidently included in Sonic 3 to make the backwards compatibility feature easier).
Contributed By: GregHead.
Walk Thru Walls
In the Icecap Zone Act 1, when you come to a wall that only Knuckles can bust through, Hold the Down button until sonic or tails looks down, and the screen pans all the way down. Then Press up and jump at the same time. The screen will start to rotate, walk in the direction of the wall and you will walk right thru it. This only works on Act 1 of The Icecap Zone.
Contributed By: havac.
Complete each achievement to get the allotted gamerscore.
|Unlockable||How to Unlock|
|Collect a Chaos Emerald.||Chaotic (10)|
|Collect all seven Chaos Emeralds.||Complete Chaos (25)|
|Finish the game.||Complete the Game (25)|
|Complete the Icecap Zone.||Fast Freeze (25)|
|Get a blue gumball.||Goodie Gumballs (10)|
|Collect 50 rings.||Halfway there... (10)|
|Finish the Marble Garden Zone.||Marble Finishes (15)|
|Score 20,000 points.||Points I (10)|
|Score 40,000 points.||Points II (15)|
|Score 80,000 points.||Points III (25)|
|Finish the Hydrocity Zone.||Wet and Wild (15)|
|Run across water.||Wet Feet (15)|
Contributed By: Guard Master.
Manage to beat a stage at with your time at exactly 9:59 and you'll net yourself an easy 100000 points.
Contributed By: Juggling Joker.
All 7 Chaos Emeralds & Super Sonic
To get all 7 Chaos Emeralds without having to complete their Special Stages, first enter the level select and sound test code. Go to the Sound Test and play the following tunes in order: 02, 04, 05, 06. You will hear an emerald sound if the code is entered correctly. To get Super Sonic after entering the previous code, just select any level from the level select and start it. Once you acquire 50 Rings, do a double-jump to become Super Sonic.
Contributed By: Shy Ranger.
Frame by frame
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.
Contributed By: Flame060.
Hidden Special Stage
On the level select menu, play sounds 01, 03, 05, 07. Highlight Special Stage 2 and press A + Start.
Contributed By: hivebrain.
Get up to Launch Base Zone. Sound any of the alarms, so that the Kamikaze birds come after you. Charge up a Super Sonic Dash in between the alarm, but do not let go of the button. The birds will continually crash into you. After about 30 seconds, you will have gained enough points to get an extra life. Continue the process for as many lives as you want.
Contributed By: stonedwal.
Play as Knuckles
When you have done the level select cheat go to the Stage Select screen and choose the special zone for playing Blue Sphere. Select Knuckles as your character and start, when you quit and go back to Stage Select and choose a stage, you'll be Knuckles without having to use the Sonic and Knuckles add on.
Contributed By: Wario_man.
Slow motion mode.
When playing any level which you have accesed using the cheat menu , pause the game and hold down B. Whilst B is held down , the game will play in slow motion mode.
Contributed By: CalmG.