The Mushroom Hill Zone is a lush, forested area filled with giant mushrooms. The Zone is fairly close to the edge of the island, yet a Zoom Tube linking to the Emerald Chamber allows Knuckles the Echidna to watch over its guests.
The Mushroom Hill Zone became the home of the Emerald Hill Folk when they fled from the wrath of Dr. Ivo Robotnik. The citizens hollowed out the mushrooms and made them their homes, seemingly quite happy with their new lives. Once Robotnik was disposed, the people of the Mushroom Hill Zone returned home, leaving the Zone abandoned.
- Sonic the Comic #56, "The Great Escape!, Part 2"
- Sonic the Comic #59, "The Revenge of Trogg, Part 1"
- Sonic the Comic #74, "The Ghost Ship, Part 1"
- Sonic the Comic #97, "Victims, Part 1"
- Knuckles Knock-Out Special, "Jake's Story"
- Knuckles Knock-Out Special, "Reflections"
- Sonic the Comic #120, "New Year Twister"