The first time you lose press go to princess's castle.Then buy a whole bunch of cannons. Try to do all cannons right.Watch the two shroobs on the sides.Only hit them if they have the white thing in their hand. Other than that object don't hit them.When the catepillar turns green hit it with a cannonball.If both shroobs have the red object or anything bout white hit the catepillar.After get ready to jump three shockwaves.The catepillar has 250 life span or called HP. Good luck :-)