Use these cheats in the game.

Infinite Lives, Access to All Items As Sonic is leaving the hole in the beginning, press Left, Right, Down, A +Start. Hold Start until the level begins.
Extra Life If you have less than 50 rings at the end of a level, run through the turnstile, then stop and jump.


Sonic the Hedgehog Glitches

Passing a wall

In the second act of the Green Hill zone, after the pit of water, there is a spring. Hit the spring and jump so you hit the corner of the wall. if done corect, sonic will get stuck on the wall and if you jump to the right, sonic can go to the nearest place above him (the waterfall leading to the chaos emerald)