From the Super Mario Wiki
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In this level, the lava below rises at regular intervals. The player starts next to the Mini-Mario, and the player needs to keep the toy and themselves away from the lava. First, the player needs to jump up the nearby steps without stepping onto the sand platforms. Once the Mini-Mario is on the top of the starts, the player needs to move across the sand platforms and jump across the gap, then they both need to use a Springboard. They both need to jump to the long platform on the right, and then the player needs to perform a Backflip to reach a Barrel above. They then need to bring the Barrel to the far right and place it so the Mini-Mario and the player can use it as a step to reach the platforms above. After crossing the platforms to the left, the player can reach the locked door.