Enter the sound test, and press B to play the following tunes in order: 19, 65, 09, 17. You should hear a ring jingle. Go back to the main menu and start a new game with A+Start to enter the level select menu. 1965 September 17 is the birthday of Yuji Naka.
Once Level Select is activated, you can use these keys: PAUSE, then hit A for soft reset, B (and hold it) for slow motion, or C for frame advance.
Enter the level select menus, and play these tunes in its sound test menu with B: 01, 09, 09, 02, 01, 01, 02, 04. 1992 November 24 was the release date of Sonic 2. Enter the level you want to play with A+Start to activate Debug mode.
Night Shade Mode
Once Debug Mode is activated, entere a stage with C+Start.
All Chaos Emeralds
To get all Chaos Emeralds, enter the Level Select menu and play the sound test tunes with C in this order: 04, 01, 02, 06. You should the emerald jingle. Now you can zoom through the levels like you already have all emeralds.
This code can be combined with the Debug Mode one: entering 01, 09, 09, 02, 01, 01, 02, 04, 01, 02, 06 in the Level Select menu will activate both codes.
Press up, up, up, down, down, down, up at the title screen to exchange Tails' name with Miles. Repeat to switch back.
Play the tracks 01, 01, 02, 04 in the Sound Test. You will end up with more continues then you will need. However, the code has a glitch and will play the Oil Ocean music constantly till you reset the game.
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