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• Able2Know - Message board of user submitted riddles and brain teasers.

• Abnorm's Conundrums - Easy, medium and difficult brain teasers without answers.

• All-Star Puzzles: Logic Problems - Collection of logic problems to solve. Printable.

• Alphabet Cartoon Puzzles - Letters of the alphabet are used as structural components for drawings of figures and faces. Spelling tips lead to the solution of the puzzles.

• The Amazing Art Site - Huge collection of optical illusions, hidden imagery, ambiguous art and upside downs.

• Archimedes' Laboratory - Recreational mathematics including puzzles to make and solve, tessellations, geometric puzzles, optical illusions, and curiosities.

• AVAV - Collection of optical illusions, brain teasers and riddles.

• Bill's Brain Teasers - A collection of visual and linguistic riddles.

• Brain Juice - An assortment of entertaining logic puzzles with solutions and indicated levels of difficulties.

• Brain Teaser World - Offers riddles, puzzles, optical illusions, and magic tricks.

• Brain Teasers - Brain teasers, riddles, logic puzzles and problems, paradoxes, optical illusions, IQ tests and logical games.

• BrainBall - A daily brain puzzle with 10 different tasks and a variety of statistics on your performance.

• BrainBashers - Brain teasers, puzzles, riddles, games and optical illusions.

• BrainBoggled.com - A collection of math, logic, and word puzzles.

• Braingle - Brain Teasers & Riddles - Contains a huge collection of user submitted and rated brain teasers and riddles. It also has a lively message board and some unique multiplayer games.

• BrainVista - Collection of solved and unsolved brain teasers.

• Confusion - It's a challenge to reach the end of this puzzle maze.

• Curiouser.co.uk - Paradoxes, puzzles, games, optical illusions, poetry, curious facts, and quotations.

• Eluzions - Featuring all sorts of games, optical illusions, puzzles, trivia, mazes, and magic tricks. Suitable for all ages.

• Eyetricks: Brain Teasers - Weekly puzzles and archives.

• A Game A Day - A puzzle site featuring a new puzzle format each weekday for each month. Puzzles are fun, educational, entertaining and are also printable.

• Game-Master's Page - Riddles, games, cryprograms, math puzzles, and forums.

• Gray Watson's Brain Teasers and Riddles - A collection of brain teasers and riddles with a guess button.

• The Grey Labyrinth - A beautifully illustrated collection of puzzles, riddles, and paradoxes. Features a changing "unsolved puzzle" plus three years worth of previous puzzles.

• Had To Play On - A community based site with competitions, challenges, awards, a help centre, forums and games.

• iRIDDLER - Challenge your mind with free online riddles/puzzles, logic games, brain teasers and view optical illusions.

• Just Riddles and More - Riddles, illusions, puzzles, and brain teasers.

• Logic Puzzles Escapades - Logic puzzles with a satirical New Zealand tone.

• The Logic Zone - Collection of problems with answers, logic puzzles and cryptograms.

• National Puzzlers' League - Crosswords & other word puzzles and games, samples; monthly puzzle magazine; 800,000 word searchable list.

• PedagoNet Brainers - Over 60 brain teasers to enhance your mind.

• Planetarium - An on-line puzzle story in twelve weekly installments.

• Professor Tangent - Have fun with games, puzzles, brainteasers and humor as you learn about logic and analysis.

• Puzzability - Some real mind benders here.

• Puzzle Contest Center - Riddles, brainteasers, cryptograms, anagrams, and logic puzzles. Compete in eight new contests monthly.

• A Puzzlemakers Site - Puzzles of all descriptions.

• Puzzles Without Rules - Free, updated, original abstract puzzles for advanced puzzle-solvers. Includes current unsolved puzzle and archive with hints and solutions.

• Pzzls - A collection of logic puzzles, riddles and brain teasers.

• Rec.puzzles Archive - An archive of many popular puzzles from the rec.puzzles newsgroup.

• Roh'El's Riddles - Offers brainteasers rated by difficulty and category.

• Say What You See! - Collection of visual brain teasers which can be solved by saying what you see.

• Sesquip Word Games - Challenging word games published in newspapers.

• The Stone - an online mystery game. Hours of clever puzzles and riddles. Puzzles challenge the mind of serious and amateur players worldwide.

• Thinking Game Forums - Chat and discussion about online thinking games.

• Thinks.com - Recreations for active minds including games, puzzles, math, words, images, books, software and web guide.

• Unitix Entertainment - Online games, puzzles and other interactive brainteasers. Fun for all ages.

• Word Juxtapoz - Word puzzles, riddles, rebuses, brain teasers, mazes, cliparts and pictures.

• Zuzzle Puzzles - Collection of puzzles including riddles, logic puzzles and sequential puzzles.