Sonic CD (Windows 95) Easter Eggs

Okay, so this is not technically an egg, more like a developer's menu. However, I figured this would be a good place for it as it lets you do quite a bit of stuff.

Locate the file named 'SONIC.INI' in your Windows directory and open it in any editor.... more

Level Select:
At the title screen, press [Up], [Down], [Down], [Left], [Right], [Space]. Only one level can be completed with this cheat turned on.

Cheat Codes
At the title screen, press [Down], [Down], [Down], [Left], [Right], [Space]... more