From the Super Mario Wiki
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The player will immediately activate the Mini-Mario upon starting the level. By climbing a ladder, the player can reach a Direction Switch and the Mini-Mario will move across a Conveyor to the right, landing on a Springboard and reuniting with the player. The next segment has the player jumping between Conveyors while avoiding the attacks from Tane Pakkuns. Before jumping onto the Springboard to reach the first above Conveyor, the player should press the Direction Switch once more. After crossing three Conveyors, the player has to press another Direction Switch and crouch on the next Conveyor to avoid a projectile. At the end of this Conveyor is the locked door.