Puzzlemakers puzzles: A leading, well-established supplier of puzzles of all types at all levels of competency: puzzles in various formats. Puzzles, crosswords, competitions, trivia and brainteasers of all descriptions.

Forum community about online thinking games. Covers brain teasers, contest puzzles, math puzzles, Supaplex, Puzzle stools, Klotski, Sokoban, and other critical thinking games. Also, you will find there more than 300 Arcade online games, as well as solutions and new tricks for many levels and games.

Win big CASH PRIZES in our challenging fun-filled puzzle contests. 7 new puzzle contests monthly. Over $947,000 in cash prizes already paid. Plus riddles, brainteasers, cryptograms, logic puzzles, crosswords, anagrams, alphametics, trivia, sweepstakes, tongue twisters, lotto, bingo and more.

For active minds and brain-teaser enthusiasts: play, create or solve intriguing puzzles; tackle tricky math problems; discover new optical illusions.

BrainBall: Mind game, IQ test & brain sport - Play with your mind

Puzzles, paradoxes, paradoxical ideas, games, poems and designs. Fun and informative. Featuring Rob's Paraboxes, optical illusions and other original work.

Games are activities providing entertainment or amusement for one person acting alone (e.g. puzzles), but usually involve two or more players or teams and can depend on chance, skill, or a combination of the two. Quizzes are an entertaining way to test your knowledge! Optical Illusions illustrate a wide range of visual anomalies and surprising optical effects.

The Grey Labyrinth is a collection of puzzles, riddles, and paradoxes designed to stimulate lateral thinking.

A community based site for puzzlers and riddlers alike. We have competitions, challenges, awards, a help centre, forums and games.

Large collection of hidden images, optical illusions, impossible objects, ambiguous art, and everything that fools the eye