Hidden options
First use the level select cheat.
Next play sound 00 a three times, a new menu will apper to allow you to change things like the player character (Knuckles and Tails can be choosen), item set such as s2 items, s3&k items,s2 random, s3 random, and you can also toggle the air cap and toggle flight.
We have more cheats and tips for this game here, Sonic the Hedgehog 2 cheats
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