From the Super Mario Wiki
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The player starts at the bottom of the ladder, at the top of which is the Mini-Mario. Using a Springboard, the player and the Mini-Mario can reach a conveyor belt, and the player has to crouch to get under a wall. Falling onto a below conveyor and crouching again, the player has to continue until they land on the conveyor with the blue Present. Moving against the conveyor and falling to the platform below, the player and the Mini-Mario can jump to the platform with the locked door.