Probably when you win the game.
on the genesis version, press ^down<> and you shoud hear a sound as if you had gotten a ring. now all you have to do is press A + start, and WALLA, YOU have gotten level select!!!!!!!!
if you have it on a playstation complitation press as above but with a replaced as square. Also, hold square for the entire time.
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You can't do it. I think you have to hack or something...
to become super sonic in sonic 2 without getting all the chaos emerals first enable the level select at the level select menu go to the sound test item and play sounds in this order:4 1 2 6 you should hear the music you get when you win a chaos emerals now select any level get 50 rings and jump.
first enlbe level select chose any level i will chose the first level if i wera you get 50 rings then jump note. super sonic is very hrper and sometimes unconthlarbulb
level select: in options play songs 19 65 09 17 then on the title screen highlight start game and then press a + start debug mode:on the level select play songs 19921124 in that order then highlight a level and press a+start.
Sonic The Hedgehog: After it says Sonic Team Presents, at the start of the game, Press: Up, Down, Left, Right, Y + Start and you can choose any level. Sonic 2:There is none. Sonic The Hedgehog 3:At the drum beat hurry and press up up down down up up up.Go down twice and you will see sound test. Sonic and Knuckles: Start Mushroom Hill Zone as Sonic. Head right until you come to the first Pull-Up machine. Jump and hang on it. Then, Press Left, Left, LEFT RIGHT RIGHT RIGHT UP UP UP then get a game over at where you select sonic or knuckles hold Y+START THEN CHOOSE A LEVEL (THE NUMBERS ARE SONIC TAILS AND KNUCKLES) That's how you go to Level Select in Sonic Classic Collection. (Note: If I got some thing not right improve my answer)