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/
MyCharades.com
Includes charades, riddles, and enigmas.
http://www.mycharades.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/
Puzzle Choice
Crosswords, wordsearches, cryptograms, quizzes, wordplay and other interactive and printable puzzles and games.
http://www.puzzlechoice.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
Online Jigsaw Puzzles
We offer you online jigsaw puzzles free to play.
http://www.onlinejigsawpuzzles.net/