Toys of Wood Oxford Large Wooden Soma Cube Puzzle - Wooden Brain Teaser Puzzle for Kids and Adults Soma Cube was invented by Piet Hein in 1933. Seven pieces made out of unit cubes must be assembled into a 3x3x3 cube. Looks simple but it is difficult to build the cube. Challenge yourself and your friends. Perfect gift as family game and always go well as a gift for him and a nice item to have for coffee table. Suitable for children 6 year plus and adults. Safe and Environmentally Friendly: it is made of sustainable wood with environmentally friendly and non-toxic paints. All wooden toys by Toys of Wood Oxford are tested by the sellers own or friends children. It conforms to EN71 and CPSA Standard and tested and certified by International Accredited Labs.