THE GOOD:Has a new character (Who wasn't in Sonic 1 or Sonic 2) named Knuckles
This game can connect to Sonic and Knuckles and make Knuckles playable and have his own adventure.
Sonic has new moves depending on what sheild he is using.
This game has a save feature.(Which oth older Sonic games lacked)
THE BAD:
It has noticeable glitches that happens sometimes.
SUMMARY:
Difficulty: Easy
This game is pretty cool. If you have trouble finding the Genesis version or your Genesis is broken then you are in luck! This game is included in a compilation called "Sonic Mega Collection" for GameCube or Sonic Mega Collection Plus for Playstation 2/XBox. So you'll still have a chance to play this game again even if your Genesis is broken!
Many people also consider this game challenging but I thought it was pretty easy. You have to try it out for yourself to see if you think if it's easy or challenging.
I rate this game a 4.5/5 (Or 9/10)