From the Super Mario Wiki, the Mario encyclopedia
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The player will immediately activate the Mini-Mario upon starting the level. To get through this level, the player has to climb between ropes and Robokikkis above while the Mini-Mario traverses passageways with Robokikkis below. The player has to time their movements with the Robokikkis so the Mini-Mario can pass by safely, and they will need to hold Robokikkis in place in order to do so. At the end of the level, the player and the Mini-Mario have to use a Springboard to reach the locked door.