It's a marble run of two different tracks that begin at opposite sides. Drop in a marble in one of the orange cups on top and watch your marble go through a series of obstacles.
Like this Plinko board. Tink, tink, tink, tink, tink, tink and your marble might end up on either of two runways.
That lead to the final marble house. Which of course has a hinged magnetic door to let out the marble avalanche when full.
Or the swirly vortex of terror. Which Drew thinks her dog might enjoy. (Try not to be distracted by her shirt. Yes I gave in to the licensed character tee...but I argue it is only a pajama shirt.)
Or your marble might run through the forest of windmills or past the mirror wall.