What is a 3D torus?
Whenever you push something through a wall, it returns from the opposite wall.
To solve a maze…
slide the blue ball along the tubes (and through the walls) to reach the red box.
To rotate the fundamental cube…
drag the walls. drag with one finger.
To scroll the space…
drag while holding the Shift key down (Windows, Mac) or with two fingers (Mac trackpad). drag with two fingers.