Easy brain training! It is "three-dimensional shape addressing" of the series.
Let's try the head exercise to see how it looks from the back side of the displayed solid.
Let's challenge how much you can answer the question in 90 seconds!
You can compete in the rankings or check daily results on the graph.
It is also possible to exchange users with each other on the message board.
It is an application to hit what kind of shape will look when you view the displayed solid from the direction of the arrow.