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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.

Made from
plastic, rubber, elastic
5.5" Dia.
Item ID
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Most of our items are in stock and will ship quickly. Orders for in-stock items placed before 5pm ET Monday through Friday, excluding Federal holidays, will ship:
Economy shipping:
within 8 days, arriving no later than the 9th business day after the order was placed.
Standard shipping:
within 4 days, arriving 5 business days after the order was placed.
Preferred shipping:
within 2 days, arriving 3 business days after the order was placed.
Expedited shipping:
within 1 day, arriving 2 business days after the order was placed.
Express shipping:
will ship the same day and arrive 1 business day later.

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