There are 3 Bosses for each Area.

1. Eggman 1
2. Metal Sonic 1
3. Zavok 1
4. Shadow 1
5. Green Bean Machine Mobile (Eggman 2)
6. Blob Caterkiller
7. Metal Sonic 2
8. Zavok 2
9.  Infinite 1
10. Possesed Knuckles 1
11. Shadow 2
12. Molten Spirit 1
13. Metal Sonic 3
14. Zavok 3
15. Molten Spirt 2
16. Metal Sonic 4
17. Shadow 3
18. Infinite 2
19. Possesed Knuckles 2
20. Metal Sonic 5
21. Mecha Sonic
22. Heavy King
23. Metal Sonic 6
24. Eggman's Sand Drill (Eggman 3)
25. Metal Sonic 7
26. Silver Sonic 1
27. Infinite 3
28. Eggman's Casino Machine 1 (Eggman 4)
29. Eggman's Casino Machine 2 (Eggman 5)
30. Metal Zavok (Zavok 4)
31. Death Egg Robot Z (Eggman 6)
32. Silver Sonic 2
33. Egg Weapon ((That Weapon Eggman used in Sonic 3D Blast) Eggman 7)
34. Chaos 1
35. Chaos 2
36. Infinite 4
37. Machine Computer
38. Infinite 5
39. Possesed Death Egg ((Infinite possesed the Death Egg and is planning to destroy the world along with Eggman and other villains.) You fight this Boss as a Giant. At the start of the fight you are given instructions by Eggman on how to defeat the Possesed Death Egg.)