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Celebrates math puzzles and mathematical recreations.

A website dedicated to the puzzling world of mathematics and computer programming.

Interactive math problems for abilities ranging from middle school to university.

Teaches and assesses fluency of multiplication and division tables using online cards. Submit data and compare results.

A demonstration of the symmetry and transformational properties of the Platonic and Archimedean solids.

Description and instruction of using the ancient Pythagorean Abacus to do arithmetic.

Puzzles for web, computers, and print; ambigrams.

Collection of brain teasers from the author of IQ books.

Brain teasers, articles and puzzles forum.