Counterbreak is a patch that makes you lose all powerups and yoshi while on the overworld, preventing players from bringing things from one level to another. In this case you can just ignore the mushroom while in the level and it'll fix itself later, making the level a lot easier.
Of course you should fight fire with fire, you should fight everything with fire.
Oooh look at my userbar!
Sadistic Designer - testing Pit without tools.
Of course you should fight fire with fire, you should fight everything with fire.
Oooh look at my userbar!
Sadistic Designer - testing Pit without tools.