Collection of puzzles, brain teasers, mind benders, logic problems, cryptograms, patterns, and enigmas. - Read more

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Information on World Puzzle Championships including links to sample word and logic puzzles. - Read more

Educational puzzles, brain teasers, mathematical recreations and word games. A resource for anagrams, cryptograms, alphametics, word puzzles, logic problems, doublets, tangrams, chess, and math quizzes. - Read more

Includes charades, riddles, and enigmas. - Read more

Pictographic puzzle microcosm of old and new playing cards, poems, games and lore. New suits: the zodiac, solar system, evolution, human family, ancient elements, astronomical basis of the calendar and compass. - Read more

Crosswords, wordsearches, cryptograms, quizzes, wordplay and other interactive and printable puzzles and games. - Read more

Original trivia, logic, visual and word puzzles. - Read more

Contests of varying difficulty and types. Also has tutorials with worked examples and practice games. [Registration required] - Read more

Printable puzzles and other diversions to help substitute teachers involve their temporary students in mind stretching activities. - Read more

Shareware software programs available to create custom crossword and word searches. - Read more

Serial adventures, continuing story and puzzles building towards a final puzzle and solution. - Read more

Collection of original puzzles developed over the years to celebrate the winter holidays. - Read more

Collection of brain teasers, logic puzzles, paradoxes and mathematical riddles. - Read more

Free online and printable Crossword and Sudoku puzzles. Puzzles are offered daily and weekly with an archive. Also offers online crossword dictionary, daily horoscopes, and discussion forum. - Read more

A puzzle hunt run every year at Stanford. - Read more