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:
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.
More on [ Brain teaser ]
Puzzle :: Video Games
Games and Puzzles :: Recreations

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. ]
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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. ]
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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 ! ]
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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.
Meta Description: [ eyetricks.com provides a wide selection of online optical illusions and other mind teasing oddities. ]
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.
Had To Play On - A community based site with competitions, challenges, awards, a help centre, forums and games.
Meta Description: [ A community based site for puzzlers and riddlers alike. We have 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.
Meta Description: [ Challenge your mind with brain teasers, logic puzzles, mind games, riddles, and optical illusions. ]
Just Riddles and More - Riddles, illusions, puzzles, and brain teasers.
Meta Description: [ a free collection of over 1000 riddles, 500 games, 50 illusions, the famous gry riddle, picture puzzles, quizzes, logic puzzles, math puzzles, jumble puzzles, mystery puzzles, brain teasers, word puzzles, vocal puzzles, funny comics, funny cat pictures, trivia, and many more activities to keep y... ]
Logic Puzzles Escapades - Logic puzzles with a satirical New Zealand tone.
Meta Description: [ Logic Puzzles by Borborygmus ]
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.
Meta Description: [ Nutrition for the Mind - Brainteasers, Games, Puzzles, Logic, Humor, Common Sense. ]
Puzzability - Some real mind benders here.
Meta Description: [ Home of Puzzability, the puzzle-writing company. ]
Puzzle Contest Center - Riddles, brainteasers, cryptograms, anagrams, and logic puzzles. Compete in eight new contests monthly.
Meta Description: [ Win big CASH PRIZES in our challenging
fun-filled puzzle contests. 7 new puzzle contests monthly. Over
$956,000 in cash prizes already paid. Plus riddles, brainteasers,
cryptograms, logic puzzles, crosswords, anagrams, alphametics, trivia,
sweepstakes, tongue twisters, ... ]
Pzzls - A collection of logic puzzles, riddles and brain teasers.
Meta Description: [ A large collection of logic puzzles, math puzzles, science puzzles and puzzling riddles. Including solutions. ]
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.
Meta Description: [ eyetricks.com provides a wide selection of online optical illusions and other mind teasing oddities. ]
Sesquip Word Games - Challenging word games published in newspapers.
Meta Description: [ Sesquip is a word game that is published in community newspapers and can increase readership. Each crossword puzzle style game increases the vocabulary of readers of the syndicated newspapers. ]
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Shashi's Homepage - Collection of puzzles, riddles and brain teasers.
Meta Description: [ Home Page of Shashishekhar Godbole. Visit for puzzles and brain teasers ]
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.
Word Juxtapoz - Word puzzles, riddles, rebuses, brain teasers, mazes, cliparts and pictures.
Meta Description: [ Ice breakers, brain teasers riddles, training games, meeting icebreakers, training icebreakers, fun pictures, wordplay, visual puzzles, vocabulary builders for the whole brain ]
Zuzzle Puzzles - Collection of puzzles including riddles, logic puzzles and sequential puzzles.
Meta Description: [ Puzzles, riddles, brainteasers, word games and more to test yourself and your friends online. ]
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