• Irodoku : A colorful variation or the Sudoku puzzle. Solve an Irodoku puzzle by using 9 different colors only once for each column, row and 9 square region. Solve online. Single solution puzzles. Free Puzzles! Enjoy!

• Emotidoku : Sudoku with a smiley. Solve an Emotidoku puzzle by using 9 different smilies only once in each column, row and 3x3 region. Solve online. Single solution puzzles. Free Puzzles! Enjoy!

See also:

• Games: Video Games: Puzzle  (912)
• Science: Math: Recreations: Games and Puzzles  (88)

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

Abnorm's Conundrums - - Easy, medium and difficult brain teasers without answers.

All-Star Puzzles: Logic Problems - - Collection of logic problems to solve. Printable.

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.

The Amazing Art Site - - Huge collection of optical illusions, hidden imagery, ambiguous art and upside downs.

Analytical Puzzles - - List of logic puzzles grouped by difficulty.

Archimedes' Laboratory - - Recreational mathematics including puzzles to make and solve, tessellations, geometric puzzles, optical illusions, and curiosities.

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

Bill's Brain Teasers - - A collection of visual and linguistic riddles.

Brain Juice - - An assortment of entertaining logic puzzles with solutions and indicated levels of difficulties.

Brain Teaser World - - Offers riddles, puzzles, optical illusions, and magic tricks.

Brain Teasers - - Brain teasers, riddles, logic puzzles and problems, paradoxes, optical illusions, IQ tests and logical games.

BrainBashers - - Brain teasers, puzzles, riddles, games and optical illusions.

BrainBoggled.com - - A collection of math, logic, and word puzzles.

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.

BrainVista - - Collection of solved and unsolved brain teasers.

ButlerWeb - - A page of about 30 brain teasers. Answers are hidden in drop down screens.

Confusion - - Its a challenge to reach the end of this puzzle maze.

Curiouser.co.uk - - Paradoxes, puzzles, games, optical illusions, poetry, curious facts, and quotations.

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

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

Eyetricks: Brain Teasers - - Weekly puzzles and archives.

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.

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.

The Grey Labyrinth - - A beautifully illustrated collection of puzzles, riddles, and paradoxes. Features a changing "unsolved puzzle" plus three years worth of previous puzzles.

Had To Play On - - A community based site with 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.

Just Riddles and More - - Riddles, illusions, puzzles, and brain teasers.

Logic Puzzles Escapades - - Logic puzzles with a satirical New Zealand tone.

The Logic Zone - - Collection of problems with answers, logic puzzles and cryptograms.

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.

Puzzability - - Some real mind benders here.

Puzzle Contest Center - - Riddles, brainteasers, cryptograms, anagrams, and logic puzzles. Compete in eight new contests monthly.

A Puzzlemakers Site - - Puzzles of all descriptions.

Puzzles Without Rules - - Free, updated, original abstract puzzles for advanced puzzle-solvesr. Includes current unsolved puzzle and archive with hints and solutions.

Pzzls - - A collection of logic puzzles, riddles and brain teasers.

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.

Sesquip Word Games - - Challenging word games published in newspapers.

Shashi's Homepage - - Collection of puzzles, riddles and brain teasers.

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.

Zuzzle Puzzles - - Collection of puzzles including riddles, logic puzzles and sequential puzzles.