Creepstone Platforms are one of the two items that populate the Growganoth worlds. However, the platforms Growganoth gives as gifts do not switch between on and off states like the ones in his realm do. Creepstone Platforms also exist in the Carnival Game, Growganoth Gulch.
It functions like a Wooden Platform and similar blocks, Growtopians can jump and walk through it from below and stand on top of it as a solid. If you place 2 Creepstone Platforms next to each other, they will connect with each other creating a continuous pattern.