Puzzle Master Professor Puzzle Brainstring RIt consists of a plastic, circular frame with elastic strings attached to it. The aim of the puzzle is to rearrange the colored strings so that they match the pattern on the instruction booklet. The puzzle is suitable for ages 8 and up, and is great for improving cognitive and problem solving skills. The Brainstring R measures approximately 3. 5 inches in diameter, making it a compact and portable puzzle. The puzzle is designed and produced by
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