The mystery of Brainstring Original isnt just how to untie a twisted knot of strings in the centre, but how it can be that all its strings can be interchanged WITHOUT creating a knot! Four groups of different coloured strings, four strings per group, moving up, down and around all six sides of a polycarbonate shell beyond just tying or untying a knot, what kind of beautiful symmetries can you create? Brainstring Original isnt just a puzzle its a work of art.

Unique spherical puzzle with stretchable elastic strings.
Can be scrambled for different difficulty levels.
Boosts problem-solving, logic, and focus.
Compact size is ideal for travel and on-the-go play.
Recommended age: 9+