The Parking Lot, created by Don Rubin, is considered "One of the "Greatest Puzzles of All Time" (Prentice Hall). Parking Lot Puzzle

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“One of the Greatest Puzzles of All Time”
Matthew J. Costello, author
The Greatest Puzzles of All Time (Prentice Hall)

Invented by Don in 1977, the Parking Lot Puzzle has appeared in hundreds of newspapers around the world and received international acclaim from puzzle fans, educators and recreational mathematicians.