Historically, burr puzzles were made from wooden pieces but are now usually made from plastic. Some are made from brass and are very expensive collector's items.
The form of the assembled burr puzzle can be anything from a ball to the shape a human figure, a ship, a bird or a free-form starlike contraption. The wooden burr puzzles are usually precision-made for tight fit and require special wood so that the pieces do not change shape too much in changing temperature and humidity.
Eight queens puzzle eight queens puzzle is the problem of putting eight chess queens on an 8×8 chessboard such that none of them is able to capture any other using the standard chess queen's moves.
Jigsaw puzzle A jigsaw puzzle is a tiling puzzle that requires the assembly of numerous small, often oddly-shaped, interlocking pieces.
Rubik's Cube Rubik's Cube is a mechanical puzzle invented in 1974 by the Hungarian sculptor and professor of architecture Ernő Rubik.
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