From the Super Mario Wiki
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Multi-Vators are a type of platform appearing in both Super Mario 3D World and Captain Toad: Treasure Tracker. Multi-Vators have a number printed on them that indicates the number of players that must be standing on the platform in order for it to move, generally allowing access to a secret. They generally appear in stages alongside Double Cherries, meaning that players can either use them or, in Super Mario 3D World, additional players to activate them.