The American Treasure Hunt Society:
Elaborate, cryptic adventures created as puzzles to be solved, as
opposed to the search for real lost or sunken treasure.
http://www.treasurehunt.org/
Rec.puzzles Archive Locations:
Directory of archive locations for North America, Europe and Asia.
http://xraysgi.ims.uconn.edu/others.html
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/
Tim's World of Puzzles:
Information on World Puzzle Championships including links to sample
word and logic puzzles.
http://www.home.zonnet.nl/kostunix/
Puzzle Choice:
Crosswords, wordsearches, cryptograms, quizzes, wordplay and other
interactive and printable puzzles and games.
http://www.puzzlechoice.com