Before you unlock the last door in the Whoa Maze, be Bowser and Thoreau.when fighting, just keep hitting him with fire. When he's about to ues an item, use Thoreau to take it. Then, use the stolen item as well as a block block (if you have one. Then when fighting Brobot,fire and dont't stop. To make it quicker, get the candy bars floating around.Eventually, Brobot will malfunction, and you'll win.