Like in Shadow the Hedgehog, the game features a branching system of story and levels. The player chooses the levels they will play after completing a level based on the dialogue and answers they make during the cutscenes in between or in the Hub Worlds.
Sonic[]
Stage 1[]
Emerald Beach
Boss: Egg Mobile
Stage 2[]
Castle Ruin
Lake Of Rings
Boss: Dark Enerjak
Stage 3[]
G.U.N. Base
Boss: Character Melee 1
Stage 4[]
Devil's Gulag
Tower Trap
Death Mountain
Boss: Shadow The Hedgehog
Stage 5[]
Egg Terminal[]
Ocean Base[]
Worm Canyon[]
Boss: Giant Worm
Rail Falls[]
Boss: Prelate: S
Stage 6[]
Blossom Village[]
Boss: Dark Enerjak
Eggtopia[]
Boss: Big Arm
Skeleton Castle[]
Boss: Tails Doll
Polar Meltdown[]
Boss: PolarBot
Badnik Island[]
Boss: Psesdo-Sonic