Ristar, Level select:
Enter ILOVEU as a password.
Ristar, Config mode:
Enter MAGURO as a password.
Ristar, Time attack mode:
Enter DOFEEL as a password.
Ristar, Boss mode:
Enter MUSEUM as a password.
Ristar, Expert mode:
Enter SUPER or SUPERB as a password.
Ristar, Reveal items:
Enter MIEMIE as a password.
Ristar, View credits:
Enter AGES as a password.
Ristar, Disable all codes:
Enter XXXXXX as a password.
Sonic 3D Blast, Level Select:
At the Press Start sceen, press B, A, Right, A, X, Up, Down, A, Start.
Sonic 3D Blast, View ending:
At the level select screen Select Final Battle. When it starts Pause the game and press B.
(supplied by: DYL3366)
Sonic Spinball, Level Select:
At the options screen, press A, Down, B, Down, X, Down, A, B, Up, A, X, Up, B, X, Up. Then hold A and press Start for level2, hold B and press Start for level 3 or hold X and press Start for level 4.
Sonic The Hedgehog, Level Select:
At the title screen, press Up, Down, Left, Right. Hold B to enter the Level Select screen.
Sonic The Hedgehog, Debug mode:
At the title screen, press Up, X, Down, X, Left, X, Right, Up, X, Down, X, Left, X, Right, X. Hold B and press Start, then while playing, press A.
Sonic The Hedgehog 2, Level Select:
At the Sound Test selection, select 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, Slo-Mo:
Use the level select cheat, go to a level and press start anywhere on the level. Then, hold A. You will be able to play in slow motion as long as you hold the A button down (you can use X to jump). Also, the game will stop letting the clock record time until you unpause it.
(supplied by: Star*Sonic)
Sonic The Hedgehog 2, Debug Mode:
First enable Level Select. Then, at the Sound Test selection, select sounds 1, 9, 9, 2, 1, 1, 2, 4. Select a level and hold B + Start until the game begins.
Sonic The Hedgehog 2, Super Sonic:
First enable Level Select. Then, at the Sound Test selection, select sounds 4, 1, 2, 6. Get 50 rings then jump to get Super Sonic.
(supplied by: shanktank11)
Sonic The Hedgehog 3, Level select:
Right after you hear SEGA but before Sonic appears, press Up, Up, Down, Down, Up, Up, Up, Up. Then press Up at the title screen.
Sonic The Hedgehog 3, Debug Mode:
First enable Level Select. Then hold B and press Start when selecting level.
Sonic The Hedgehog 3, Bonus level:
First enable Level Select. Then at the Sound Test selection, play sounds 1, 3, 5, 7. Hightlight Special Stage 2, hold B and press Start.
Dr. Robotnik's Mean Bean Machine, Final Level:
Enter one of these passwords to begin the final level:
Easy:
Yellow Bean, Orange Creature, Blue Bean, Blue Bean
Normal:
Purple Bean, Yellow Bean, Orange Creature, Clear Bean
Hard:
Orange Creature, Clear Bean, Purple Bean, Orange Creature
Hardest:
Red Bean, Red Bean, Clear Bean, Yellow Bean
(supplied by: DragonHUL)