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Nick's Mathematical Puzzles - http://www.qbyte.org/puzzles/
A collection of an assortment of problems to try to solve, with hints, and solutions. Includes daily update feed link. |
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Erich's Puzzle Palace - http://www.stetson.edu/~efriedma/puzzle.html
Original games using triangles, numbers, squares, equations. |
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Torsten Sillke - http://www.mathematik.uni-bielefeld.de/~sillke/
A professor presents his extensive collection of puzzles which use counting, arithmetic, algebra and whole numbers. |
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The Exhibitionists - http://www.liverpoolmuseums.org.uk/nof/maths
Interactive, practical math puzzles relating to the management of a museum exhibit. Sponsored by the (British) National Museums Liverpool. |