checked-no see also SONIC & KNUCKLES (vc-gen) =>Stage Select & Sound Test: After the Sega logo appears but before the screen with Sonic appears, quickly press Ux2 Dx2 Ux4. You should hear a tone. Now, on the title screen, press Dx2 to access the Sound Test option. Enter the sound test to play music from the game or select the game from any level. =>Debug Mode: On the stage select screen, highlight a stage, hold <A> and press <START>. This mode can also be accessed from the Stage Select / Sound Test menu by playing songs 01, 03, 05, 07. =>All Chaos Emeralds: Enter the sound test and play songs 02, 04, 05, 06. =>"Night Mode": Enter the sound test, highlight a level and press <C>+<START> to begin that level in the "Night Mode." While playing, some elements in the display will be darkened. =>Extra Special Stage: Enter the stage select menu, set the sound test to 07, then highlight Special Stage 2 and press A+<START>. This will allow you to play the 8th Chaos Emerald special stage, which is normally inaccessible.