Contains information about the IQ, and things related to it, including a test, and high intelligence societies …
Contain Exercises for the brain, simply yet effective, and also include an IQ test, reflex test, and more.
A puzzles site for kids with lots of crossword puzzles, sliding puzzles, word search puzzles, sudoku, jigsaw puzzles.
Forum community about online thinking games. Covers brain teasers, jigsaw and crossword puzzles, Supaplex, Klotski, Lemmings, and other critical thinking games.
A large collection of brain teasers, puzzles and riddles. The site is updated with illusions and games regularly and has five new puzzles added each week.
The web’s largest online archive of riddles for RiddleNuts. Surf through more than 650 family friendly riddles or join the Daily Riddle email list to get a brainteaser in your mail box.