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Oskar's hysteresis mazes

This puzzle is based on an original mechanical puzzle by Oskar van Deventer. Navigate the maze using east/west movement only and use the sloping walls to push the ball north/south.

Later mazes include special yellow switch points where you can choose between horizontal or vertical movement Your choice will stay in force until you reach another switch point.

The photo on the right shows the original Hysteresis Key puzzle designed by Oskar. Here the red key and blue 'rocker' interact to create the maze. Thanks to careful design of the maze the key slides easily into the lock but removing it again is quite a different matter

concept & mechanical puzzle - © Oskar van Deventer 2000
maze designs - © Andrea Gilbert 2000
puzzlescript implementation - © Andrea Gilbert 2021