It's the last two stages, and a major physics-based momentum injection to the system! I hope you enjoyed watching this as I did playing it, and don't forgot to check out the audio commentary over on my SassyKosmo account.
Note to viewers from US/Canada: The mellow BGM is a result of the emulator being set to Europe.
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Sonic the Hedgehog and respective content/characters (c) Sega.