Gordian’s Knot by Think Fun™ is the World’s Most difficult Take-Apart Puzzle! No doubt about it! This six-sided Brain Teaser is not for those who are looking for an easy mind bending puzzle- this is for those who want a serious challenge! In ancient times the great oracles foretold that whoever solved the mystery of Gordian’s Knot would rule the world! For four hundred years countless contenders tried it and failed until one day Alexander the Great took up the challenge and succeeded. Are you ready for the new Gordian’s Knot? This puzzle version was invented by Dutchman Frans de Vreugd who used a computer to determine the most difficult six piece puzzle configuration. Includes a 69 step solution book! Ages 8 to Adult. Availability: Usually ships the next business day. 4044TF FREE GROUND SHIPPING ON ALL ORDERS OVER $75.00. Please entry FREESHIPPING in the coupon box on the second page of the checkout. Offer valid for the 48 contiguous states. Certain oversize and drop ship items are excluded.