A giant Buzzy Beetle boss, inspired by SMWCP. It will wait for Mario to approach it, after which it will spin in its shell and chase him. When it hits a wall, a rock will drop down. If Mario grabs the rock and tosses it at the boss, it will turn upside-down and expose its underside, which Mario can jump on to damage it.
By default, it takes 5 hits to defeat. Its attacks will become more aggressive after 2 hits. After defeating it, it will charge to the left and die when it hits the wall.
If the extra bit is set, the level will end when the boss dies.