This is the start of greatness, the first half to the best Sonic game in the series.
It does everything 2 does but better while also looking better than ever. New ability (split second shield), new ability shields (fire, electric, and bubble), fantastic music, and level design. This is also the game where Knucles is introduced to the series.
Can't forget the Chaos Emerald bonus stages. This version is easily the best in the series with the perfect amount of challenge and fun. (Looking at you terrible Sonic 2 bonus stages)
Getting into them is also more convenient all you have to do is find the massive hidden ring (no 50 rings needed). Multiple of these are hidden in each stage. Now, if you have 50 rings and pass a checkpoint, you are treated with another bonus stage that allows you to earn rings, shields, and extra lives.
This game is a blast from start to finish. The only downside is the small number of stages (6 Zones), but don't forget this is technically half a game that gets expanded with the next release in the series.
It does everything 2 does but better while also looking better than ever. New ability (split second shield), new ability shields (fire, electric, and bubble), fantastic music, and level design. This is also the game where Knucles is introduced to the series.
Can't forget the Chaos Emerald bonus stages. This version is easily the best in the series with the perfect amount of challenge and fun. (Looking at you terrible Sonic 2 bonus stages)
Getting into them is also more convenient all you have to do is find the massive hidden ring (no 50 rings needed). Multiple of these are hidden in each stage. Now, if you have 50 rings and pass a checkpoint, you are treated with another bonus stage that allows you to earn rings, shields, and extra lives.
This game is a blast from start to finish. The only downside is the small number of stages (6 Zones), but don't forget this is technically half a game that gets expanded with the next release in the series.