From the Super Mario Wiki
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The player starts on a high platform, with a sand platform in the center and the Mini-Mario on the right. While avoiding the Firebirds paths and projectiles, the player needs to lead the Mini-Mario down three platforms by falling through the sand platforms. On the third platform is a Katakata Kaen Heihō that the player may need to move out of the way. Below the third sand platform is a pool of lava with a smaller platform above it. The locked door is located on the ground below.