100000 Points
Beat a stage at with your time at exactly 9:59.
(Thanks to Tuxedo)

All 7 Chaos Emeralds & Super Sonic
To get all 7 Chaos Emeralds without having to complete their Special Stages, 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.
(Thanks to Tuxedo)

Level Select and Sounds (When Locked-On to Sonic & Knuckles)
Start a game and go to Angel Island Zone Act 1. Go to one of the swings that you hang from and grab on. While Sonic is swinging, press: Left, Left, Left, Right, Right, Right, Up, Up, Up. Pause the game and press A to take you back to the title screen. Press: Down, Down to find the newly unlocked Sound Test menu. Enter it, where you can play all of the sounds/music in the game and warp to any level.
(Thanks to Tuxedo)

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