Planet Freedom

"As you both well know, Planet Freedom is made up of two separate dimensions. The outer world, the one you live in is known as the Land of the Sky, and the inner layer is known as the Land of Darkness."

- Dr. Robotnik explaining.

Planet Freedom (惑星フリーダム Wakusei furīdamu) is where all of the movie takes place. It is known as Sonic's home planet, along with many other characters' planet. It is separated in two dimensions, The Land of The Sky and The Land of Darkness.