From the Super Mario Wiki
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The player starts under a ladder, and they can progress one of two ways: climbing the ladder and defeating the Shy Guys they encounter, or moving under a Brickman to the right and climb the ladder at the end. Both paths will lead to the Mini-Mario. After collecting the Mini-Mario, the player has to use a Springboard to get onto the upper platform, defeating the Shy Guys if they have not already. With the Mini-Mario on the far left platform, the player has to climb down the ladder and lead the Mini-Mario through the passage, collecting the Yellow Present in the passage. Next, the player has to safely guide the Mini-Mario to the right, through the Brickman's debris, to get to the locked door.