Abstract: A puzzle of the type having an openable loop with two internal subloops in the form of two single turn coils spiraling continuously into each other through semi-oval non-flat curves, and a closed loop with two internal subloops in the form of two double turn coils spiraling continuously into each other through semi-oval flat curves. The two loops, when interengaged in accordance with a predetermined position, present the problem of their disengagement without opening the openable loop. For quick disengagement of the two loops in case of mistakes in the solution of the puzzle or for interengaging the two loops in the predetermined position, the openable loop is formed with a hook and an eye so that it may be opened and closed.