This is "Odd Floor Plan Spot the Difference." Have fun while training your "memory," "concentration," "attention," "judgment," "recall," and "spatial cognition" to stop brain decline! Supervised by Dr. Yoshihiko Koga, Honorary Professor at Kyorin University! This is a used item. I believe there are no noticeable stains or writing. Please understand that this is a personal inspection, and I will sell it to those who can accept this.