Sega Mega Drive: Cheats and Tips
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Level Select
At the main menu, go to options and highlight the 'Sound Test'. Play the following sounds 19, 65, 9, 17, then press start to go back to main menu. Next, when sonic and tails show up, hold A and press start for a level select.
100% success rate. 

Super Sonic
After you have done the level select cheat, there is a sound test in the level select menu. Listen to the sounds 4, 1, 2, 6, in that order, then choose a level. When you have 50 rings or more jump up and you will turn into Super Sonic.
Submitted by Nasher. 100% success rate. 

Above are all the Sonic the Hedgehog 2 cheats, codes, tips, hints, secrets and walkthoughs that are currently in the Cheat Chest database. Because we do not have every game for Sega Mega Drive, Cheat Chest unfortunately can not guarantee that each Sonic the Hedgehog 2 cheat we have works. If any of the cheat codes above is incorrect, please rate the Sonic the Hedgehog 2 cheats at our partner site Neon Gaming, as enough bad ratings will automatically remove the cheat from our database.