Brain Teasers
- Brain teasers, riddles, logic puzzles and problems, paradoxes, optical illusions, IQ tests and logical games.
- http://brainden.com/

Puzzles Without Rules
- Free, updated, original abstract puzzles for advanced puzzle-solvers. Includes current unsolved puzzle and archive with hints and solutions.
- http://puzzleswithoutrules.blogspot.com/

BrainBall
- A daily brain puzzle with 10 different tasks and a variety of statistics on your performance.
- http://brainball.playwithyourmind.com/

Thinks.com
- Recreations for active minds including games, puzzles, math, words, images, books, software and web guide.
- http://www.thinks.com/

Thinking Game Forums
- Chat and discussion about online thinking games.
- http://www.infordigital.com/

The Logic Zone
- Collection of problems with answers, logic puzzles and cryptograms.
- http://myweb.tiscali.co.uk/thelogiczone/

Pzzls
- A collection of logic puzzles, riddles and brain teasers.
- http://www.pzzls.com

Able2Know
- Message board of user submitted riddles and brain teasers.
- http://able2know.com/forums/viewforum.php?f=8

Logic Puzzles Escapades
- Logic puzzles with a satirical New Zealand tone.
- http://www.nzorgan.com/borborygmus/logic_puzzles.htm

Zuzzle Puzzles
- Collection of puzzles including riddles, logic puzzles and sequential puzzles.
- http://www.zuzzle.com/

BrainBashers
- Brain teasers, puzzles, riddles, games and optical illusions.
- http://www.brainbashers.com/

AVAV
- Collection of optical illusions, brain teasers and riddles.
- http://www.kuponh.karoo.net/avav/

BrainBoggled.com
- A collection of math, logic, and word puzzles.
- http://www.brainboggled.com/

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.
- http://home.ca.inter.net/~aranoman/

Eyetricks: Brain Teasers
- Weekly puzzles and archives.
- http://www.eyetricks.com/brainteasers/

Gray Watson's Brain Teasers and Riddles
- A collection of brain teasers and riddles with a guess button.
- http://256.com/gray/teasers/

Roh'El's Riddles
- Offers brainteasers rated by difficulty and category.
- http://users.telenet.be/jo.roel/Riddles/index.html

Brain Teaser World
- Offers riddles, puzzles, optical illusions, and magic tricks.
- http://www.brainteaser-world.com/

Word Juxtapoz
- Word puzzles, riddles, rebuses, brain teasers, mazes, cliparts and pictures.
- http://www.wordjuxtapoz.com/

Had To Play On
- A community based site with competitions, challenges, awards, a help centre, forums and games.
- http://www.hadtoplayon.com

Game-Master's Page
- Riddles, games, cryprograms, math puzzles, and forums.
- http://game-master.us/

Archimedes' Laboratory
- Recreational mathematics including puzzles to make and solve, tessellations, geometric puzzles, optical illusions, and curiosities.
- http://www.archimedes-lab.org

Curiouser.co.uk
- Paradoxes, puzzles, games, optical illusions, poetry, curious facts, and quotations.
- http://www.curiouser.co.uk

All-Star Puzzles: Logic Problems
- Collection of logic problems to solve. Printable.
- http://www.allstarpuzzles.com/logic/

Rec.puzzles Archive
- An archive of many popular puzzles from the rec.puzzles newsgroup.
- http://rec-puzzles.org/

A Puzzlemakers Site
- Puzzles of all descriptions.
- http://www.puzzlemakers.net

Professor Tangent
- Have fun with games, puzzles, brainteasers and humor as you learn about logic and analysis.
- http://www.professortangent.org

Eluzions
- Featuring all sorts of games, optical illusions, puzzles, trivia, mazes, and magic tricks. Suitable for all ages.
- http://eluzions.com/

Unitix Entertainment
- Online games, puzzles and other interactive brainteasers. Fun for all ages.
- http://unitix.com/entertainment

Sesquip Word Games
- Challenging word games published in newspapers.
- http://www.sesquip.com

PedagoNet Brainers
- Over 60 brain teasers to enhance your mind.
- http://www.pedagonet.com/brain/brainers.html

Just Riddles and More
- Riddles, illusions, puzzles, and brain teasers.
- http://www.justriddlesandmore.com

Say What You See!
- Collection of visual brain teasers which can be solved by saying what you see.
- http://www.eyetricks.com/swys/swys0101.htm

iRIDDLER
- Challenge your mind with free online riddles/puzzles, logic games, brain teasers and view optical illusions.
- http://www.iriddler.com

Bill's Brain Teasers
- A collection of visual and linguistic riddles.
- http://www.billsgames.com/brain-teasers/

Planetarium
- An on-line puzzle story in twelve weekly installments.
- http://www.beholder.co.uk/planetarium

Braingle - 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/

The Stone
- an online mystery game. Hours of clever puzzles and riddles. Puzzles challenge the mind of serious and amateur players worldwide.
- http://www.thestone.com

National Puzzlers' League
- Crosswords & other word puzzles and games, samples; monthly puzzle magazine; 800,000 word searchable list.
- http://www.puzzlers.org/

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.
- http://www.agameaday.com

BrainVista
- Collection of solved and unsolved brain teasers.
- http://www.brainvista.com

Puzzability
- Some real mind benders here.
- http://www.puzzability.com/

Brain Juice
- An assortment of entertaining logic puzzles with solutions and indicated levels of difficulties.
- http://www.brainj.net/puzzleindex.php

The Grey Labyrinth
- 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/

Puzzle Contest Center
- Riddles, brainteasers, cryptograms, anagrams, and logic puzzles. Compete in eight new contests monthly.
- http://www.contestcen.com/