Find a path from the yellow square to the red square going through all the green squares without retracing your steps or crossing your previous path, moving only up, down, left or right at each move--never diagonally. The black squares are not to be entered or crossed.

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From Page-a-Day Amazing Mind Benders Calendar 2014, Workman Publishing, New York, by Puzzability (Mike Shenk, Amy Goldstein, Robert Leighton). Puzzle for September 10.

For some reason, on the Chrome browser in Android, the characters used for diagonal arrows show up with a blue background imposed over (within) the green background.  This doesn't happen in Windows, or on the characters that are right-angle turns.

Posted by Charlie on 2018-07-17 08:05:13