Sonic the Hedgehog 3 & Knuckles

At the end of Sonic the Hedgehog 2, the evil Dr. Robotnik had his Death Egg downed from orbit by the heroes, Sonic the Hedgehog and his companion Miles "Tails" Prower. Having not been completely destroyed after all, the Death Egg has crash-landed on the Floating Island, taking it to the ocean below. This island has special properties - not least of which being its eponymous power of magical suspension. When Dr. Robotnik detects the presence of a massive Chaos Emerald within the island's depths, ...