- Logicville - 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.
- Tim's World of Puzzles - Information on World Puzzle Championships including links to sample word and logic puzzles.
- Puzzle Choice - Crosswords, wordsearches, cryptograms, quizzes, wordplay and other interactive and printable puzzles and games.
- Puzzle Space - Information about language and culture independent puzzles and logic games.
- The Puzzle Page - Collection of puzzles, brain teasers, mind benders, logic problems, cryptograms, patterns, and enigmas.
- VNC: Volker-Noelle.com - Collection of brain teasers, logic puzzles, paradoxes and mathematical riddles.
- Adventure Puzzles - Serial adventures, continuing story and puzzles building towards a final puzzle and solution.
- The Substitute Teacher: Puzzles and other Diversions - Printable puzzles and other diversions to help substitute teachers involve their temporary students in mind stretching activities.
- Holiday Puzzles - Collection of original puzzles developed over the years to celebrate the winter holidays.
- MyCharades.com - Includes charades, riddles, and enigmas.
- Variety Games - Shareware software programs available to create custom crossword and word searches.
- Rainier Beer Bottlecap Puzzles - The answers to the bottlecap rebus style puzzles found on Rainier Beer and Pearl Beer caps.
- The Game - A puzzle hunt run every year at Stanford.
- The Puppeteer's Cosmic Puzzle - 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.
- Puzzletome - Contests of varying difficulty and types. Also has tutorials with worked examples and practice games. [Registration required]
- Perplexing Problems - Logic problems submitted by users in categories including mathematics, words, and mysteries.
- Puzzle Monster - Original trivia, logic, visual and word puzzles.
- Sudoku Solver - A free utility to solve and email Sudoku puzzles.
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