Unlock Levels and Sound Test
Select 'Sonic & Knuckles' and then choose any character and go to Angel Island. Play until you find a swinging vine then jump and hang onto it. Now press Left, Left, Left, Right, Right, Right, Up, Up, Up. If you have entered the code correctly You will hear a ring sound as confirmation. Click on the 'File' menu and restart the game, when the game has restarted you will see the 'Title' screen, press 'Down' twice until 'Sound Test' appears.
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