リバカル　【反転計算脳トレゲーム】

One-digit addition and multiplication. However, the numbers are flipped vertically and horizontally. You can tell which direction it is inverted by the color of the numbers. The color of the title logo and the rotating direction are the directions in which the color is reversed. The rest is easy, just calculate.
Turn your head to the full and aim for a high score.

[Recommended for such people! ]
・Person who is good at calculation
・Person who is looking for brain training game
・Those who are not satisfied with ordinary calculations