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If you select a number between 00 and 07 for the sound test in the stage select, it will change which special stage you enter when you select special stage. By selecting 07 before going to the special stage, you will end up in a hidden 8th special stage. It's a pretty cool special stage, if only for the corkscrews that were thrown in at the end! Enjoy! ^_^
Sonic 2 (2,013): Hidden 8th Special Stage - Knuckles