A pack of colourfully illustrated cards bursting with maths puzzles that will put children and adult s maths skills to the test. Each brain-teasing puzzle sorts out the boffins from the buffoons by testing their maths skills, including code-breaking, multiplication and arithmetic. The cards are wipe clean and the pack includes a special pen, making the pack entirely self contained, easily portable and a great gift. WARNING! Not suitable for children under 36 months because of small parts. Choking Hazard. Ink from pen may not be washable.