Green Hill Zone (Sonic Blast), Sonic Wiki Zone

Green Hill Zone (グリーンヒル, Gurīn Hiru?, lit. "Green Hill") is the first Zone of Sonic Blast, which is represented by the green color and its natural environment. It is a tropical forest that features hills, palm trees and wooden bridges. Having learned that Dr. Robotnik is building a new stronghold called the Silver Castle in an attempt to find the pieces of the Chaos Emerald, Sonic and Knuckles have agreed to join forces and put an end to Robotnik's plans. After defeating the mad doc in Green Hil

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Green Hill Zone, THE Sonic the hedgehog Wiki