Guides  /  Super Mario 3D World + Bowser's Fury  /  Green Stars  /  World 6  /  World 6-B: Fire Bros. Hideout #3 World 6-B: Fire Bros. Hideout #3 – Super Mario 3D World Green Stars Guide ADVERTISEMENT World 6-B contains a single Green Star to collect. Green Star #1 Defeat the two Hammer Bros., the the two Boomerang Bros., and the Fire Bros. within the time limit to earn the Green Star.