Brainstring Brain Teaser: Advanced. It's so Knotty! Building on the success of the original, this advanced version adds more sides, colored strings and easy-to-grasp rubber tips. More challenging than the original, Brainstring Advanced will stretch your puzzle solving skills to the next level. For 1 players, ages 7 and up. Toys > Category > Games, Puzzles, Boutique Toys > Games > Brain Games. Toys & Games > Puzzles.
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