Put in the following passwords:
MUSEUM - Boss Mode
SUPER or SUPERB - Expert Mode
AGES - Show Credits
ILOVEU - Pick Level
MAGURO - Config Mode
DOFEEL - Time Attack
XXXXXX - Disable all cheats
Sonic 3D Blast - Pick Level
Go to the press Start screen and press B, A, Right, A, X, Up, Down, A, Start
Sonic the Hedgehog - Pick Level
Go to the title screen and press Up, Down, Left, Right. Now Hold B to get the Pick Level screen
Sonic the Hedgehog - Get Debug Mode
Go to the title screen and press Up, X, Down, X, Left, X, Right, Up, X, Down, X, Left, X, Right, X. Now Hold B and press Start. During gameplay press A
Sonic the Hedgehog 2 - Pick Level
Go to the sound test screen and pick sounds 19, 65, 9 & 17. Hold X and press Start, then hold B and press Start at the Sonic/Tails screen.
Sonic the Hedgehog 2 - Debug Mode
Go to the sound test screen and pick sounds 1, 9, 9, 2, 1, 1, 2, 4. Select a level and hold B Start until the game begins.
Sonic the Hedgehog 3 - Pick Level
BEFORE Sonic appears but right after you hear SEGA press Up, Up, Down, Down, Up, Up, Up, Up. Now at the main menu press Up
Sonic the Hedgehog 3 - Debug Mode
Do the Pick level code above then when selecting a level Hold B and press Start
Sonic the Hedgehog 3 - Extra Level
Do the Pick level code above then go to the sound test and play sounds 1, 3, 5, 7. Now highlight special stage 2 and HOLD B and press START
Unlocking all hidden games
When you initiate Sonic The Hedgehog 1, 2, 3, Sonic And Knuckles, Sonic 3D blast, Dr. Robotnic's Mean Bean Machine, or Sonic Spinball, the screen states that it is logging the game data. That indicates the game is logging in that you have initiated that game once. After initiating a game fifty times, it no longer shows that game-logging screen. It stops the logging sequence screen from ever starting a game again and from then on, just starts the Genesis program itself. To unlock a hidden game, you must start a particular Mega Collection game fifty times, continually pressing Z to exit it, then enter into the game repeatedly. Some hidden games do not necessarily require that you start up fifty times, but you eventually need to do so to unlock all the hidden games.
Flicky: Start Dr. Robotnic's Mean Bean Machine before reaching 50 times.
Blue Spheres: Start Sonic The Hedgehog about 18 to 21 times.
Sonic 3 And Knuckles: Unlocked sometime in the process of starting Sonic 1, Sonic 3, Sonic And Knuckles, and Sonic 3-D Blast fifty times.
Knuckles In Sonic 2: Unlocked in the process of starting Sonic Spinball and Sonic 2 fifty times.
Ristar: Start all games Sonic 1, 2, 3, Sonic & Knuckles, Sonic 3 and Knuckles, Knuckles in Sonic 2, etc. fifty times.
Get S&K2 game
To get the Sonic T.H.2 & Knux game,play Sonic T.H.2 & Sonic Spinball 20 times each.
To got Onic Jam You Have Have To Beat Sonic & Knuckles With both Characters. And Also Beat Sonic 3D Blast.
Submitted by Rex Raptor
Get Sonic racing
Play every game 20 times each and collect the emeralds in each game that needs to collects emeralds.
Submitted by gene
SONIC THE HEDGEHOG 2: unlock super sonic
once you have entered the level select cheat go to the sound test and choose these sounds in order using the C button 4, 1, 2 and 6
Submitted by harry davey
Beat Ristar on Boss mode 5 times, and beat super hard mode 10 times. New features will be unlocked, amnd blue sphere will be replaced with SADX.
Submitted by GreatSonicHedgehog