From the Super Mario Wiki, the Mario encyclopedia
The level begins with a Bill Blaster firing Blurps. Mario must hit a P Switch to clear it away, then avoid a Hammer Bro and some Bob-ombs to hit another P Switch and clear out a Bill Blaster shooting big Blurps. Mario will then encounter Bowser, and can fire Big Koopa Troopas at him to hit the axe and clear the level.
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