Old kingdom situated in the Great Forest that's been there for multiple generations. The Acorn Kingdom had always had a feud with Robotroplois and Robotnik, but after repeated cases of Robotnik going after the chaos emeralds for nefarious purposes King Acorn appointed a personal guard whose task was to defend the chaos emeralds. This worsened the feud, and led to the king and queen being assassinated, along with most of the Emerald Guard. It is now ruled by Queen Sally, daughter of the old rulers, who has a vindictive drive to take down Robotnik.