Oobleck - is a material that is very easy to make from mix cornstarch and water. With a very interesting feature. If he is in a calm state and you gently and slowly touch him, then they are liquid. If you hit it quickly and hard, it becomes solid.
Our character jump/run automatically on tiptoe across the glass floor - after each jump, the glass cracks underfoot. There are places where the floor is filled with OOBLECK. The moment when we step on floor with OOBLECK our task to tap fast to stark jump harder - to turn OOBLECK from liquid to solid material and we didn't sink.