"Easy Cube Pink" Mitsuhiro Odawara Price: ¥1980 #MitsuhiroOdawara #Mitsuhiro_Odawara #book #nature/general This is Easy Cube Pink. My child used it. It's a 3D puzzle where you use 7 types of pieces, each made of 3-5 connected cubes, to arrange them into the shapes shown on the problem cards. It naturally develops logical thinking and spatial reasoning skills. The box is torn, but there are no issues with the product itself.