 Gray Watson's Brain Teasers and Riddles - http://256.com/gray/teasers/ A collection of brain teasers and riddles with a guess button. |
 Confusion - http://cnfsn.tripod.com/ It's a challenge to reach the end of this puzzle maze. |
 Thinks.com - http://www.thinks.com/ Recreations for active minds including games, puzzles, math, words, images, books, software and web guide. |
 Abnorm's Conundrums - http://www.angelfire.com/oh/abnorm/ Easy, medium and difficult brain teasers without answers. |
 Puzzles Without Rules - http://puzzleswithoutrules.blogspot.com/ Free, updated, original abstract puzzles for advanced puzzle-solvers. Includes current unsolved puzzle and archive with hints and solutions. |
 Say What You See! - http://www.eyetricks.com/swys/swys0101.htm Collection of visual brain teasers which can be solved by saying what you see. |
 Eyetricks: Brain Teasers - http://www.eyetricks.com/brainteasers/ Weekly puzzles and archives. |
 Bill's Brain Teasers - http://www.billsgames.com/brain-teasers/ A collection of visual and linguistic riddles. |
 Braingle - http://www.braingle.com/ Includes a huge collection of user submitted and rated brain teasers and riddles. It also has a message board and some unique multi-player games. |
 BrainVista - http://www.brainvista.com Collection of solved and unsolved brain teasers. |
 Planetarium - http://www.beholder.co.uk/planetarium An on-line puzzle story in twelve weekly installments. |
 The Amazing Art Site - http://members.lycos.nl/amazingart/ Huge collection of optical illusions, hidden imagery, ambiguous art and upside downs. |
 The Grey Labyrinth - http://www.greylabyrinth.com/ A beautifully illustrated collection of puzzles, riddles, and paradoxes. Features a changing "unsolved puzzle" plus three years worth of previous puzzles. |
 Curiouser.co.uk - http://www.curiouser.co.uk Paradoxes, puzzles, games, optical illusions, poetry, curious facts, and quotations. |
 iRIDDLER - http://www.iriddler.com Challenge your mind with free online riddles/puzzles, logic games, brain teasers and view optical illusions. |
 BrainBoggled.com - http://www.brainboggled.com/ A collection of math, logic, and word puzzles. |
 A Game A Day - http://www.agameaday.com A puzzle site featuring a new puzzle format each weekday for each month. Puzzles are fun, educational, entertaining and are also printable. |
 All-Star Puzzles: Logic Problems - http://www.allstarpuzzles.com/logic/ Collection of logic problems to solve. Printable. |
 National Puzzlers' League - http://www.puzzlers.org/ Crosswords and other word puzzles and games, samples; monthly puzzle magazine; 800,000 word searchable list. |
 A Puzzlemakers Site - http://www.puzzlemakers.net Puzzles of all descriptions. |
 Had To Play On - http://www.hadtoplayon.com A community based site with competitions, challenges, awards, a help centre, forums and games. |
 Just Riddles and More - http://www.justriddlesandmore.com Riddles, illusions, puzzles, and brain teasers. |
 Brain Teaser World - http://www.brainteaser-world.com/ Offers riddles, puzzles, optical illusions, and magic tricks. |
 Professor Tangent - http://www.professortangent.org Have fun with games, puzzles, brainteasers and humor as you learn about logic and analysis. |
 Eluzions - http://eluzions.com/ Featuring all sorts of games, optical illusions, puzzles, trivia, mazes, and magic tricks. Suitable for all ages. |
 Puzzability - http://www.puzzability.com/ Some real mind benders here. |
 BrainBashers - http://www.brainbashers.com/ Brain teasers, puzzles, riddles, games and optical illusions. |
 Zuzzle Puzzles - http://www.zuzzle.com/ Collection of puzzles including riddles, logic puzzles and sequential puzzles. |
 Brain Juice - http://www.brainj.net/puzzleindex.php An assortment of entertaining logic puzzles with solutions and indicated levels of difficulties. |
 The Logic Zone - http://myweb.tiscali.co.uk/thelogiczone/ Collection of problems with answers, logic puzzles and cryptograms. |
 Archimedes' Laboratory - http://www.archimedes-lab.org Recreational mathematics including puzzles to make and solve, tessellations, geometric puzzles, optical illusions, and curiosities. |
 PedagoNet Brainers - http://www.pedagonet.com/brain/brainers.html Over 60 brain teasers to enhance your mind. |
 Word Juxtapoz - http://www.wordjuxtapoz.com/ Word puzzles, riddles, rebuses, brain teasers, mazes, cliparts and pictures. |
 Rec.puzzles Archive - http://rec-puzzles.org/ An archive of many popular puzzles from the rec.puzzles newsgroup. |
 Puzzle Contest Center - http://www.contestcen.com/ Riddles, brainteasers, cryptograms, anagrams, and logic puzzles. Compete in eight new contests monthly. |
 Roh'El's Riddles - http://users.telenet.be/jo.roel/Riddles/index.html Offers brainteasers rated by difficulty and category. |
 Brain Teasers - http://brainden.com/ Brain teasers, riddles, logic puzzles and problems, paradoxes, optical illusions, IQ tests and logical games. |
 AVAV - http://www.askix.com/avav/ Collection of optical illusions, brain teasers and riddles. |
 Pzzls - http://www.pzzls.com A collection of logic puzzles, riddles and brain teasers. |
 Thinking Game Forums - http://www.infordigital.com/ Chat and discussion about online thinking games. |
 BrainBall - http://brainball.playwithyourmind.com/ A daily brain puzzle with 10 different tasks and a variety of statistics on your performance. |