Sonic 3D Blast Cheats (Genesis)

At the start of the game where you see "Press Start" quickly press: B, A, Right, A,C, Up,
Down, A, the level select screen will appear when you begin a game.

At the begining scenario (with Sonic running) hit the game cartrage as if you were going
to freeze it. 

  When you do the screen will read "Congatulations, you have discovered the secret level
select!"

Enter the Level Select code twice. Select any stage that has Tails or Knuckles in it (the
first stage will do). Get 50 rings and visit Tails or Knuckles. When the special stage
begins, press A + Start and you will receive the emerald for that course.

Collect 50 rings, then enter the special stage and get an emerald. Let yourself die, then
collect another 50 rings and re-enter the special stage.

  Give your rings to the same person you used when you went to the special stage the
first time. You will go to the same stage where you found the emerald, but if you
complete it this time, you'll get an extra life.

  Collect 100 rings to get a second extra life. Die and repeat the cycle as often as
desired.

Enable the Level Select code, then start a new game. To skip to the next level, pause the
game and press A.

  Alternatively, push A + B + C + Start at the same time to skip a level.