Location This page is a stub. E Acorn Plains [Edit] [Talk] Acorn Plains. Acorn Plains is a place in the first world in New Super Mario Bros. U. It introduces the Super Acorn powerup. Lemmy Koopa is the boss of this world. Retrieved from "https://nintendo.fandom.com/wiki/Acorn_Plains?oldid=540971" Categories: Location articles Pages needing a quote Class E articles Mario locations New Super Mario Bros. U Locations Community content is available under CC-BY-SA unless otherwise noted.