Check the listing for details. Inverse Cube Brain Teaser Wooden Puzzle. Condition: New. Listed at 14.95 USD. Inverse Cube Brain Teaser Wooden Puzzle Product Description: This beautiful interlocking cube wooden puzzle combined of 6 pieces. The object is to take the puzzle apart then and put it back together into its original cube shape. When taken apart, you'll see that the cube is built from two parts that each of them is the precise inverse of the other, and each one of the two puzzle parts contains 3 pieces, which makes this perfect cube once they are joined. This wooden brain teaser puzzle was created by a mathematician by the name of Sam Mcflay, Umass University USA. Approximate Diamentions: 2.3" x 2.3" x 2.3" Difficulty Level (1-5): 3 Advanced Solution or Instructions Available. Return Policy Merchandise may be returned for a full refund excluding shipping charges. Merchandise must be returned in its original packaging and in unused and sealed condition and packed sufficiently to avoid being damaged in shipping. Please contact us for a Return Authorization number (RMA number)and return instructions, before returning the merchandise. Shipping Policy We can combine items for discounted shipping, please make sure you are purchasing all items on the same cart and send us a request for total, we'll combine the product price and shipping cost. Payment Policy We accept PayPal payment. Orders will be shipped once payment is received.