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A Game A Day (Popularity:  )
http://www.agameaday.com
A puzzle site featuring a new puzzle format each weekday for each month. Puzzles are fun, educational, entertaining and are ...
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Archimedes' Laboratory (Popularity: )
http://www.archimedes-lab.org
Recreational mathematics including puzzles to make and solve, tessellations, geometric puzzles, optical illusions, and curiosities.
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BrainBashers (Popularity: )
http://www.brainbashers.com/
Brain teasers, puzzles, riddles, games and optical illusions.
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BrainBoggled.com (Popularity: )
http://www.brainboggled.com/
A collection of math, logic, and word puzzles.
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Curiouser.co.uk (Popularity: )
http://www.curiouser.co.uk
Paradoxes, puzzles, games, optical illusions, poetry, curious facts, and quotations.
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Eluzions (Popularity: )
http://eluzions.com/
Featuring all sorts of games, optical illusions, puzzles, trivia, mazes, and magic tricks. Suitable for all ages.
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Had To Play On (Popularity: )
http://www.hadtoplayon.com
A community based site with competitions, challenges, awards, a help centre, forums and games.
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iRIDDLER (Popularity: )
http://www.iriddler.com
Challenge your mind with free online riddles/puzzles, logic games, brain teasers and view optical illusions.
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Professor Tangent (Popularity: )
http://www.professortangent.org
Have fun with games, puzzles, brainteasers and humor as you learn about logic and analysis.
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Purple Hunt (Popularity: )
http://www.purplehunt.com
A fun site for puzzles, free games, treasure hunts, cryptograms and intrigues. Prizes for winners.
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The Grey Labyrinth (Popularity: )
http://www.greylabyrinth.com/
A beautifully illustrated collection of puzzles, riddles, and paradoxes. Features a changing "unsolved puzzle" plus three years worth of previous ...
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Zuzzle Puzzles (Popularity: )
http://www.zuzzle.com/
Collection of puzzles including riddles, logic puzzles and sequential puzzles.
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