ALL Emeralds
Go to the 'Level Select' option and then to the sound test that is located in the bottom-right corner of the screen. If you play sounds 04, 01, 02, 06 in order you will hear the 'emerald-collected' sound and ALL emeralds will now be collected and you will be able to turn super by collecting 50 rings, then pressing the jump button twice.
More tricks, tips and cheats for this game are right here - Sonic the Hedgehog 2 cheats
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