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Cryptarithms are mathematical puzzles in which the digits in an arithmetic expression are replaced by letters of the alphabet. The object is to work out which numbers correspond to each letter. Generally the letters are chosen so that the sum also sp...

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Can you solve these brain-teasers and logic puzzles?

Dr Mike

The Math Forum is the comprehensive resource for math education on the Internet. Some features include a K-12 math expert help service, an extensive database of math sites, online resources for teaching and learning math, plus much more.

Puzzlecrypt.com hosts John de Cuevas own unique cryptic puzzles. Here you

Explore the updated online encyclopedia from Encyclopaedia Britannica with hundreds of thousands of articles, biographies, videos, images, and web sites.

Logicville is a website collection of mathematical games, puzzles, and brain teasers, including anagrams, cryptograms, cryptarithms or alphametics, word puzzles, logic games, doublets, tangrams, sudoku, chess problems, and many educational and math p...

Comprehensive encyclopedia of mathematics with 13,000 detailed entries. Continually updated, extensively illustrated, and with interactive examples.