Contemporary and clear, crisp and clean: the Ultimate IQ Test range features many of the best classic puzzles, with a phenomenal selection of brand new designs! The Chequer Cube Puzzle is easily modified into a long line of smaller cubes, attached with an elastic cord. The challenge becomes returning it to square one! The All in 15 Puzzle is a number crunching nightmare that has been taken to a numbing new level. Will your problem solving skills make every row add up to 15? Take on the challenge! Both Puzzles include IQ Challenge Booklet.Materials: Wood, Elastic. Dimensions: 8L x 8W x 8H (Box) ; Weight: 0.5 lbs.