It attacks mainly by rolling around the planetoid in a fashion similar to a boulder. Mario can only fight Rollodillo while Rock Mario. There are a total of two rounds. When Rollodillo gets dizzy and stops rolling, Mario needs to transform into a boulder and ram into its weak spot, its rear; a Spin Attack is rendered useless against this boss. Mario will need to hit Rollodillo's rear four times. After this, the boss explodes and grant Mario the Power Star.