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String Theory

This knotty little puzzle is all about thinking inside the box. The brainchild of Dutch inventor Guido Lap, it uses simple elements to stretch your spatial reasoning to new limits. Elastic bands connect colored buttons on opposite sides of a clear, plastic case. Your challenge is to group the buttons by color, sliding them along the slots cut in the clear plastic, without getting yourself (and the cords inside) all tied up in knots. A great brain-teasing puzzle for older children and adults. Made in China.

Brainstring was developed by Dutch inventor Guido Lap. Guido combined an elegant design with an intellectually challenging concept and it was an instant success in Europe. Inspired by that success, he has worked with various inventors throughout the years to produce smart, unique, artfully-designed puzzles that appeal to puzzle-enthusiasts worldwide.

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Item ID
Made from
plastic, rubber, elastic
5.5" Dia.

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