Best for crosswords, codewords, sudoku & other puzzles, games and trivia
Fascinating math puzzles, and more, in Cliff Pickover's inimitable style: Tunnel of Callicrates, Fragile Fractions, Exclusionary Squares and Cubes, Triangle of the Gods, and much more.
An encyclopedic collection of math resources for all grades. Arithmetic games, problems, puzzles, and articles.
A good archive to dip into.
The webmaster, Ed Pegg Jr, is a twenty year member of the National Puzzler's League, and frequently contributes to the New York Times crossword, Games, and National Public Radio's Sunday Puzzler. This fantastic site is packed full of interesting goodies, and there's a weekly math puzzle.
The puzzles presented here are selected for the deceptive simplicity of their statement, or the elegance of their solution. They range over geometry, probability, number theory, algebra, calculus, trigonometry, and logic. All require a certain ingenuity, but usually only pre-college math. Some puzzles are original.
A good selection of puzzles, by Guy Kindler at Tel Aviv University, graded from simple to tough - but most requiring some undergraduate maths knowledge.
Brain teasers and puzzles in logic, mathematics and creative thinking.
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