Crosskit.com
- 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.
- http://www.crosskit.com

Puzzle Monster
- Original trivia, logic, visual and word puzzles.
- http://www.puzzlemonster.com/

Puzzletome
- Contests of varying difficulty and types. Also has tutorials with worked examples and practice games. [Registration required]
- http://www.puzzletome.com/

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.
- http://www.cosmicpuzzle.com/

The Game
- A puzzle hunt run every year at Stanford.
- http://zonker.stanford.edu/~snitch/game/

Variety Games
- Shareware software programs available to create custom crossword and word searches.
- http://www.variety-games.com/

MyCharades.com
- Includes charades, riddles, and enigmas.
- http://www.mycharades.com/

Holiday Puzzles
- Collection of original puzzles developed over the years to celebrate the winter holidays.
- http://www.radix.net/~erewhon/puzl/index.html

The Substitute Teacher: Puzzles and other Diversions
- Printable puzzles and other diversions to help substitute teachers involve their temporary students in mind stretching activities.
- http://www.subhelp.com/

Adventure Puzzles
- Serial adventures, continuing story and puzzles building towards a final puzzle and solution.
- http://www.questexperiences.com/quest2/PortsToAdventure/AdventurePuzzles/default.asp

VNC: Volker-Noelle.com
- Collection of brain teasers, logic puzzles, paradoxes and mathematical riddles.
- http://www.volker-noelle.com/iq/index.shtml

Puzzle Choice
- Crosswords, wordsearches, cryptograms, quizzes, wordplay and other interactive and printable puzzles and games.
- http://www.puzzlechoice.com

Tim's World of Puzzles
- Information on World Puzzle Championships including links to sample word and logic puzzles.
- http://www.home.zonnet.nl/kostunix/

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.
- http://www.logicville.com/