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A Brain teaser is a form of puzzle that involves a lot of thinking (mental/cognitive activity). Normally, this includes thinking in conventional ways with given constraints in mind; sometimes, it also involves lateral thinking. Logic puzzles and riddles are specific types of brain teasers.

Example:

Q: If three hens lay three eggs in three days, how many eggs does a hen lay in one day?
A: One third. (Note: 3 hens = 3 eggs / 3 days → 3 hens = (3 / 3) (eggs / days) → 1 hen = (1 / 3) (egg / days))

It is easy for people to argue about the answers of many brain teasers; in the given example with hens, one might claim that all the eggs in the question were laid in the first day, so the answer would be one, or comment that it is rare for a hen to lay a fraction of an egg.

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You just can't make this stuff up. http://www.greekrealm.com/forum/humor-riddles-games-brain-teasers/12013-you-just-cant-make-stuff-up.html
GreekRealm (GreekRealm) Tue, 15 Dec 2009 02:27:30 -0000
You just can't make this stuff up. http://www.greekrealm.com/forum/humor-riddles-games-brain-teasers/12013-you-just-cant-make-stuff-up.html
you pick... RT: GTS, WYR, UTS, WWYD, photo hunt, who said that....or I could so some brain teasers :)
HS_JB (Melissa Noyes-Jonas) Mon, 14 Dec 2009 23:37:09 -0000
you pick... RT: GTS, WYR, UTS, WWYD, photo hunt, who said that....or I could so some brain teasers :)
AreYouGame.com - The Web's best selection of board games, brain teasers and puzzles. http://bit.ly/6XHQM2
jjweiser (Jordan Weiser) Mon, 14 Dec 2009 21:01:24 -0000
AreYouGame.com - The Web's best selection of board games, brain teasers and puzzles. http://bit.ly/6XHQM2
MegaClue - a new game available in the Brain Teasers section: http://smartestgames.com/classics.php?id=1187 #puzzle #puzzles
smartestgames (Smartest Games) Mon, 14 Dec 2009 16:15:34 -0000
MegaClue - a new game available in the Brain Teasers section: http://smartestgames.com/classics.php?id=1187 #puzzle #puzzles
Brain teasers beckon in #RTP Weekahead 12/14. http://bit.ly/7UKs9H #SITT
SciTri (ScienceintheTriangle) Mon, 14 Dec 2009 14:50:20 -0000
Brain teasers beckon in #RTP Weekahead 12/14. http://bit.ly/7UKs9H #SITT
Brain teasers beckon in #RTP Weekahead 12/14. http://bit.ly/4B1qug #SITT
SciTri (ScienceintheTriangle) Mon, 14 Dec 2009 14:49:08 -0000
Brain teasers beckon in #RTP Weekahead 12/14. http://bit.ly/4B1qug #SITT

 
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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.
Meta Description: [ User submitted and ranked brain teasers, riddles, quizzes, trivia, logic problems and mind puzzles. Free online games and message boards. ]

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.
Meta Description: [ Features a wide variety of free, online word games, puzzles, brainteasers, anagrams and more for ages 9 thru adult. Fun, challenging, educational. ]

A Puzzlemakers Site - Puzzles of all descriptions.
Meta Description: [ 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. ]

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

All-Star Puzzles: Logic Problems - Collection of logic problems to solve. Printable.
Meta Description: [ Magazine-class logic problems to test your deductive skills. ]

500 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.

Analytical Puzzles - List of logic puzzles grouped by difficulty.
Meta Description: [ Logic Problems - grouped by difficulty. Includes answers and hints. ]

Archimedes' Laboratory - Recreational mathematics including puzzles to make and solve, tessellations, geometric puzzles, optical illusions, and curiosities.
Meta Description: [ For active minds and brain-teaser enthusiasts: play, create or solve intriguing puzzles; tackle tricky math problems; discover new optical illusions. ]

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

Bill's Brain Teasers - A collection of visual and linguistic riddles.
Meta Description: [ A ton of jumbled words, odd shapes and other oddities that can be read as everyday words and phrases! A great puzzle page to spend time on! See if your friends can figure them out! ]

Brain Juice - An assortment of entertaining logic puzzles with solutions and indicated levels of difficulties.
Meta Description: [ Food-colouring-and-preservative-free mental stimulation; Logic riddles with little stories. All answers are provided. ]

Brain Teaser World - Offers riddles, puzzles, optical illusions, and magic tricks.
Meta Description: [ Brain Teasers World: Optical illusions,riddles,puzzles, brain teasers and more ! ]

404 Brain Teasers - Brain teasers, riddles, logic puzzles and problems, paradoxes, optical illusions, IQ tests and logical games.
Meta Description: [ Brain teasers, riddles, logic puzzles, paradoxes, optical illusions, IQ tests, logical games etc. ]

BrainBashers - Brain teasers, puzzles, riddles, games and optical illusions.
Meta Description: [ Brain teasers, puzzles, online games, optical illusions and jigsaws. ]

BrainBoggled.com - A collection of math, logic, and word puzzles.
Meta Description: [    ]

BrainVista - Collection of solved and unsolved brain teasers.
Meta Description: [ The most comprehensive collection of Brain Teasers. Educational and recreational puzzle collections for everyone - classified based on difficulty level and type. Be a member for puzzle solutions, It's free !!! ]

ButlerWeb - A page of about 30 brain teasers. Answers are hidden in drop down screens.
Meta Description: [ A special page just for brain teasers in Butler Webs 100's of Jokes & Cartoons. ]

Confusion - Its a challenge to reach the end of this puzzle maze.
Meta Description: [ Confusion. A challenging online puzzle game. ]

Curiouser.co.uk - Paradoxes, puzzles, games, optical illusions, poetry, curious facts, and quotations.
Meta Description: [ Puzzles, paradoxes, paradoxical ideas, games, poems and designs. Fun and informative. Featuring Rob's Paraboxes, optical illusions and other original work. ]

Eluzions - Featuring all sorts of games, optical illusions, puzzles, trivia, mazes, and magic tricks. Suitable for all ages.
Meta Description: [ 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... ]

Eye-Pleasing, Mind-Teasing 3-D Conundrums - Scans from a book of puzzles, includes English translations.

Eyetricks: Brain Teasers - Weekly puzzles and archives.
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Just Riddles and More - Riddles, illusions, puzzles, and brain teasers.
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Puzzle Contest Center - Riddles, brainteasers, cryptograms, anagrams, and logic puzzles. Compete in eight new contests monthly.
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Meta Description: [ A large collection of logic puzzles, math puzzles, science puzzles and puzzling riddles. Including solutions. ]

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Meta Description: [ eyetricks.com provides a wide selection of online optical illusions and other mind teasing oddities. ]

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404 Shashi's Homepage - Collection of puzzles, riddles and brain teasers.
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The Amazing Art Site - Huge collection of optical illusions, hidden imagery, ambiguous art and upside downs.

The Grey Labyrinth - A beautifully illustrated collection of puzzles, riddles, and paradoxes. Features a changing unsolved puzzle plus three years worth of previous puzzles.
Meta Description: [ The Grey Labyrinth is a collection of puzzles, riddles, and paradoxes designed to stimulate lateral thinking. ]

The Logic Zone - Collection of problems with answers, logic puzzles and cryptograms.
Meta Description: [ Logic problems, online and interactive, logic puzzles, brain teasers, cryptograms and other puzzles too! No specialist knowledge is required to answer these logic problems, puzzles and questions, although the occasional problem or puzzle may require a small amount of math. ]

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

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

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