Act 1:
This is the boss for Angel Island act 1. It is very lousy for Sonic users, as you can see, as it only gives off flames for a certain distance.

To defeat it easily, just jump on it before it shoots and whack it!

Then, balance Sonic on the boss and keep whacking it! (When Sonic hits a boss, he would rebound upwards. When he hits the boss and rebounds upwards, don't immediately go back to land. Try moving towards the boss again in mid-air and whack him again. Do this continuously and win!)

When you win for act 1, a sign would drop indicating that you have completed act 1. But before it drops, try hitting it up again. Every hit you give it would give you 100 points. Also, you might get a crate when it lands on the ground again.

Knuckles is harder. For Knuckles, Robotnik can shoot bombs towards you. The rest would be the same.

Midi file for all bosses for act 1 unless stated.