Joyeee Large Creative 8 Rings Tower of Hanoi Wooden Logic Brain Teaser Puzzle Idea Joyeee Tower of Hanoi is made of high quality, toxic free natural rubber wood, toxic free, buy with confidence! Invented by a mathematician in 1883, The Tower of Hanoi ring puzzle has challenged monks and mathematicians for centuries. Based on fable from Benares, India, it is believed that when the tower is completely moved the universe will end. Suitable for children / baby 3 year and up. Develop baby's logic and cognitive ability, cultivate baby's eye and hand coordination ability, train baby fingers muscle flexibility. Product packaging size: 9 x 4 x 3 inch (24 x 11 x 8 cm). Weight: 1 pound (0.5 kg).