Stop Time in Sonic 2
Pause the game and hold A for the rest of the stage to play without time passing. Press X to jump and spin dash while holding A. You will move without time passing, but the enimies will still move. To stop the game just relese A.
Ristar
Start the following games fifty times: Sonic The Hedgehog, Sonic The Hedgehog 2, Sonic The Hedgehog 3, Sonic And Knuckles, Sonic 2 And Knuckles, Sonic 3 And Knuckles, Sonic 3-D Blast, Sonic Spinball; and start Blue Spheres 30 to 40 times.
Comix Zone (Japanese version)
Select manual mode, then press Z(3), Up(3), Down(3), L, R, Z. A sound will confirm correct code entry.
The Ooze (Japanese version)
Select options mode, then press Up, L, Down, R, Up, Z, Down, L, Up, R, Down, Z. A sound will confirm correct code entry.
Flicky
Start Dr. Robotnic's Mean Bean Machine before reaching 50 times. Alternately, have a memory card in slot A with a saved game from another Sega game.
Knuckles In Sonic 2
Unlocked in the process of starting Sonic Spinball and Sonic 2 fifty 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.
Blue Spheres
Start Sonic The Hedgehog and Sonic 3D Blast twenty times each.
Unlocking 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.
Sonic 3 - Debug Mode
Go to the Stage Select screen and hold button B. Then pick a level and start.
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