27 of first cylinder 23 may include a large diameter handle 73 and second end 41 of second cylinder 35 may similarly include a large diameter handle 75 second cylinder 35 may also include a pin 77 projection from outer surface 43 adjacent first end 37 handles 73 and 75 may preferably be approximately 2 inches in length potentially increasing the overall length of first and second cylinders 23 and 35 by about 2 inches each puzzle 71 may further include a third cylinder 81 having a first end 83 a second end 85 an outer surface 87 and an inner surface 91 the length of cylinder 81 may preferably be about 12 inches to match the preferred length of the main portion of first and second cylinders 23 and 35 third cylinder 81 may include a groove 93 on its inner surface 91 and may have a diameter larger than that of second cylinder 35 which closely approximates the diameter of handles 73 and 75 of first and second cylinders 23 and 35 respectively to prevent any two adjacent cylinders either 23 and 35 or 35 and 81 from being withdrawn as a pair without having worked both of pins 33 and 77 through grooves 47 and 77 respectively so that two independent solutions must be determined sequentially to some degree the use of handles 73 and 75 requires each of grooves 47 and 77 to be navigated by each of pins.