Brainstrings

This knotty little puzzle is all about thinking inside the box. 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.