Pen & Rose

1st step:

Press the four arrows to rotate the shape to make it a Penrose shape.

2nd step:

Press the four arrows to rotate the shape to let the ball fall and reach the destination.

I set the camera to orthographic so that the cubes in the scene can be combined into these impossible shapes. In some levels, I placed some roads made of invisible cubes closer to the camera. Because there is no perspective, the ball seems to be able to move on those impossible shapes. In addition, since the camera rotates with the shape in the second stage, it is difficult for the player to tell whether the shape is rotating. So I added some checkered backgrounds.