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Brain teaser soma cube mind game was invented by Piet Hein in 1933. Seven pieces made out of unit cubes must be assembled into a 3x3x3 cube This wooden puzzle looks simple but it is not easy to build the cube, one of very challenging wooden puzzles. 5 puzzle solutions are included in the puzzle box. Challenge yourself and your friends Perfect gift or stocking fillers for him and older children. It is a nice item to have for coffee table Suitable for children 6 year plus and adults. Ideal mind games and puzzles for adults. It is ideal for Christmas stocking fillers stuffers for kids and adults Safe and environmentally friendly: it is made of sustainable wood with environmentally friendly and non-toxic paints. It conforms to EC EN71, ASTM F963 and CPSIA toys safety Standards; being tested and certified by International Accredited Labs.