Book Boxes from Sorrento
CATALOGUE of the Puzzles in Collection
Cast Metal Puzzles
Chinese concentric Puzzle Balls
Chinese Ivory Puzzles and Puzzle Compendiums
David Singmaster's "Sources in Recreational Mathematics" etc.
Ephemera puzzles
Gallery of Puzzle Sculptures by Miguel Berrocal and Franco Rocco
Griddlers, Nonograms and Picture Grid puzzles
Harry Eng's Impossible Bottles
Hoffmann's Puzzles Old & New
Index by Class to Puzzles of Month
Miguel Berrocal's Puzzle Sculptures
Ninomiya's Puzzles
Six-Piece Burr
Solitaire Boards
Stewart Coffin has very generously made the 2018 edition of his
Ap-Art Compendium of Geometrical Puzzles freely available to the Puzzle World in PDF format (10.4 Mb).
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or if you find any factual or programming errors on this website.