The Donut Plains is a location from Super Mario World. A part of Donut Plains is seen in Episode 3, but otherwise it does not appear in Super Mario Bros. Z, however it is mentioned by Professor E. Gadd in Episode 4. File:Smw vsSmbz.JPG Nothing is known about the location, other than that Mecha Sonic was searching for a Chaos Emerald there. Considering the robot's ability to sense the Emeralds, it is likely one is there.