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

Crosskit.com [more]
Offers printable crossword and sudoku puzzles. Puzzles are offered daily and weekly with an archive. Also offers a crossword dictionary, daily horoscope, and discussion forums.
http://www.crosskit.com

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

Logicville [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.
http://www.logicville.com/

MyCharades.com [more]
Includes charades, riddles, and enigmas.
http://www.mycharades.com/

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

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

Puzzle Space [more]
Information about language and culture independent puzzles and logic games.
http://www.geocities.com/puzzlespace/

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

Rainier Beer Bottlecap Puzzles [more]
The answers to the bottlecap rebus style puzzles found on Rainier Beer and Pearl Beer caps.
http://www.geocities.com/shabber_1/rainier.html

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

The Puzzle Page [more]
Collection of puzzles, brain teasers, mind benders, logic problems, cryptograms, patterns, and enigmas.
http://www.geocities.com/oosterwal/puzzle.htm

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

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

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