Green Hill Zone is one of the returning stages, and is exclusive to the 3DS version of the game. The stage comes from the Sonic the Hedgehog franchise and is based on the stage from the original game. The main thing in the background is a giant loop, which Sonic traverse many times in the original game.
The actual stage is constructed of various parts of the original Green Hill Zone, with the middle portion being a half-pipe. This half-pipe can crumble if it is attacked too much during the battle, creating a pit for characters to fall in; these portions will come back after a short time. Checkpoints from the Sonic games act as stage hazards, appearing randomly and blue at first, until someone hits them and they spin around while colored red. Other players take damage while they are spinning.
