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Layers of a 3D maze are shown from top to bottom. You can move horizontally within a layer if there is no wall between compartments. You can move from a compartment with white floor to the the compartment immediately below it and back. Find the shortest path from the red to the green point.
Contributed by: Izidor Hafner (January 2014)
Open content licensed under CC BY-NC-SA
 M. Gardner, The Colossal Book of Short Puzzles and Problems (D. Richards, ed.), New York: W. W. Norton, 2006 pp. 280–281.
Wolfram Demonstrations Project
Published: January 17 2014