Sonic Advance 2

Sonic Advance 2 is the direct sequel to Sonic Advance. The story follows Sonic as he sets out to save his friends and retrieve the seven magical Chaos Emeralds from series antagonist Doctor Eggman. Gameplay consists of the player completing various levels as one of five characters, each with their own unique attributes. After each zone is completed, the player faces Doctor Eggman in a boss battle. (wikipedia.org)