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Logicville is a website collection of mathematical games, puzzles, and brain teasers, including anagrams, cryptograms, cryptarithms or alphametics, word puzzles ...

Interactive educational math activities for grades K-12. Includes math games, worksheets, flashcards and more.

Alien Tiles Official Web Page, The Universe's Most Challenging and Fun Puzzle Game

Win big CASH PRIZES in our Interactive Online Games. Over $981,000 in cash prizes already paid in our puzzle contests. Plus riddles, brainteasers, ...

Home of Simon Singh: author, journalist and TV producer, specialising in science and mathematics. Cryptography is one of his specialties, and his site has a lot of ...

Contains examples of Scott Kim's ambigrams.

Miscellaneous resources and links, including Nick's Mathematical Puzzles.

Leave planner is a holiday and staff leave planner system for your office, factory and your entire business.