From the Super Mario Wiki, the Mario encyclopedia
The level starts with several Grinders following Mario. He must jump from platform to platform while avoiding Cannons, then make his way past several Burners and fall down. Mario must then move to the right while avoiding Lava Bubbles and hit a Beanstalk that leads to a door. Taking that door leads directly to Bowser, and Mario can use the lift to jump over him and hit the ax, clearing the level.
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