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Burr puzzles. A burr puzzle is an interlocking puzzle consisting of notched sticks, combined to make one three-dimensional, usually symmetrical unit. These puzzles are traditionally made of wood, but versions made of plastic or metal can also be found. Quality burr puzzles are usually precision-made for easy sliding and accurate fitting of the ...
Although the puzzle is a disentanglement-type puzzle, it also has mechanical puzzle attributes, and the solution can be derived as a binary mathematical procedure. The Chinese rings are associated with the tale that in the Middle Ages , knights would give these to their wives as a present, so that in their absence they may fill their time.
Game designer Cliff Johnson defines a meta-puzzle as "a collection of puzzles that, when solved, each give a piece of a master puzzle." [2] A metapuzzle is a puzzle that unites several puzzles that feed into it. For example, five puzzles that had the answers BLACK, HAMMER, FROST, KNIFE, and UNION would lead to the metapuzzle answer JACK, which ...
Chess puzzle. Chess problem; Computer puzzle game; Cross Sums; Crossword puzzle; Cryptic crossword; Cryptogram; Maze. Back from the klondike; Ball-in-a-maze puzzle; Mechanical puzzle. Ball-in-a-maze puzzle; Burr puzzle; Word puzzle. Acrostic; Daughter in the box; Disentanglement puzzle; Edge-matching puzzle; Egg of Columbus; Eight queens puzzle ...
Crossword-like puzzles, for example Double Diamond Puzzles, appeared in the magazine St. Nicholas, published since 1873. [32] Another crossword puzzle appeared on September 14, 1890, in the Italian magazine Il Secolo Illustrato della Domenica. It was designed by Giuseppe Airoldi and titled "Per passare il tempo" ("To pass the time"). Airoldi's ...
A combination puzzle, also known as a sequential move puzzle, is a puzzle which consists of a set of pieces which can be manipulated into different combinations by a group of operations. Many such puzzles are mechanical puzzles of polyhedral shape , consisting of multiple layers of pieces along each axis which can rotate independently of each ...
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The first plastic made from synthetic components, it was developed by Leo Baekeland in Yonkers, New York, in 1907, and patented on December 7, 1909. [ 3 ] Bakelite was one of the first plastic-like materials to be introduced into the modern world and was popular because it could be moulded and then hardened into any shape.