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Recreational mathematics including puzzles to make and solve, tessellations, geometric puzzles, optical illusions, and curiosities.
http://www.archimedes-lab.org
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Offers riddles, puzzles, optical illusions, and magic tricks.
http://www.brainteaser-world.com/
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Brain teasers, puzzles, riddles, games and optical illusions.
http://www.brainbashers.com/
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A collection of math, logic, and word puzzles.
http://www.brainboggled.com/
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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.
http://www.braingle.com/
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Collection of solved and unsolved brain teasers.
http://www.brainvista.com
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Paradoxes, puzzles, games, optical illusions, poetry, curious facts, and quotations.
http://www.curiouser.co.uk
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A puzzle site featuring a new puzzle format each weekday for each month. Puzzles are fun, educational, entertaining and are also printable.
http://www.agameaday.com
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A beautifully illustrated collection of puzzles, riddles, and paradoxes. Features a changing "unsolved puzzle" plus three years worth of previous puzzles.
http://www.greylabyrinth.com/
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A community based site with competitions, challenges, awards, a help centre, forums and games.
http://www.hadtoplayon.com
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Challenge your mind with free online riddles/puzzles, logic games, brain teasers and view optical illusions.
http://www.iriddler.com
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Riddles, illusions, puzzles, and brain teasers.
http://www.justriddlesandmore.com
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Crosswords & other word puzzles and games, samples; monthly puzzle magazine; 800,000 word searchable list.
http://www.puzzlers.org/
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Have fun with games, puzzles, brainteasers and humor as you learn about logic and analysis.
http://www.professortangent.org
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Some real mind benders here.
http://www.puzzability.com/
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