A nostalgic, old-fashioned toy: a set of 8 brain teasers. A brain teaser is a puzzle where two or more parts are intertwined, and the goal is to connect or separate them. The fun comes from the process of trial and error to solve it, and after completion, returning it to its original state is also part of the enjoyment. This set includes brain teasers with different designs, perfect for enjoying at home for both adults and children, and can also improve concentration. It's also ideal for brain training and passing the time. Why not try challenging yourselves with your family during the New Year holidays? (^^) *This is a toy intended for ages 3 and up. This item is unopened and new, but has been stored at home, so please refrain from purchasing if you are sensitive about such things. Christmas, New Year, Showa Retro, Miscellaneous Goods, Montessori, Toys, Educational Toys, Montessori, Shichida Method, Kodomo Challenge, Gakken Popular Keywords... Montessori