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/

Thinking Games
Brain teasers, puzzles, online games, thinking games, jigsaws, supaplex, klotski, lemmings, critical thinking games and new levels.
http://www.infordigital.com