Sonic the Hedgehog Pocket Adventure
It is an 8-bit conversion of Aquatic Ruin Zone from Sonic the Hedgehog 2, with only minor variations in the level layout. This zone, and Secret Plant, are the only levels in the game which feature underwater sections. At the end, Sonic falls down to find Knuckles the Echidna, who initiates a duel.
- The music of act 1 is a remix of Mushroom Hill Zone Act 1 from Sonic & Knuckles.
- The music of act 2 is a remix of Hydrocity Zone Act 1 from Sonic the Hedgehog 3.