Hungarian Rings Quad

Designed and made by E. Pap circa 1982.
(plastic, 4.9 by 5.7 by 5/8 inches pieces)

A generalization of the standard Hungarian Rings puzzle. This puzzle has a definite "prototype" feel to it, and if you turn it upside-down and shake you can get a ball to fall out (handy if you get tired of trying to solve it).