Three Dry Bones
From the Super Mario Wiki, the Mario encyclopedia
Hence the title, the player has 100 seconds to collect as many 1-Ups as possible. In order to get the 1-Ups, the player needs to jump on the Dry Bones in a continuous order without touching the ground. By doing this, points will be generated and then 1-Ups. Because Dry Bones take some time to "regenerate" after being jumped on, the player can Wall Jump until they do.
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