Brain

• Brain Den ...Logic Puzzles
• Brain Fun ...Brain Teasers, Puzzles, Games & more
• Brain Teasers
• Brain Teasers
• Brain Teasers and Games with a Neuroscience Angle ...A selection of the 50 Brain Teasers that people have enjoyed
• BrainBashers...puzzles
• BrainFood
• Braingle ...Brain Teasers, Riddles, Trivia, Brain Exercises
• Brain Metrix
• Brainteasers ...word picture puzzles
• Buoyancy Brainteasers
• FunBrain
• Games for the Brain
• Lumosity Brain Training ...Improve memory, increase focus, and feel sharper
• Mathematical Brain Teasers and Puzzles
• Mesosyn ...Mental & Brain Exercises
• ProProfs ...Play brain games, free puzzle games and create your own game!
• Sharp Brains ...Science-based information and guidance for Brain Health and Fitness

Puzzle Pages

• A1 Puzzles and Crosswords...Interactive Crosswords, Puzzles
• Archimedes Laboratory...puzzles
• Bits & Pieces Puzzle Arcade
• Break the Code
• Classic Puzzles
• Clifford Pickover's Page...puzzles within
• Combination Lock ...puzzle
• Cricklers...wordpuzzles
• Erich's Puzzle Palace
• FreeInternetPuzzle ...Kill some time with games that are intellectually stimulating
• Games Magazine ...Consumer magazine featuring a wide variety of verbal and visual puzzles, brainteasers, trivia quizzes, etc
• How to Make Puzzles
• Inside Japans Puzzle Palace
• Jed's List of Situation Puzzles
• Ken's Puzzle of the Week
• Mar 25 -Kersnap ...An online puzzle booklet by Bram Cohen
• Lateral Thinking Puzzles

    Crossword Puzzles

• Crossword Puzzle Maker ...Makes creating a crossword puzzle quick and easy
• Regex Crossword ...Welcome to the fantastic world of nerdy regex fun
• The Atlantic Crossword ...Daily free mini puzzle
• The Crossword Network ...Free Crosswords - Online Crossword Compiler
• XWord Info ...New York Times Crossword Answers and Insights

    Games

• Internet Scrabble Club
• Prognosticate ...news game
• Scrabble
• Scrabble Dictionary ...Is Your Word An Official Scrabble One?
• SCRABBLE + Logology
• Scrabble Help
• Scrabble Rack

Illusions

• Akiyoshi's Illusions
• BrainDen Optical illusions ...Several types of optical illusions sorted into detailed categories
• Exploratorium Illusions
• Eye Tricks ...optical illusions
• lllusion Sciences ...A new illusion every week
• Mighty Optical Illusions
• Miscellaneous Optical Illusion ...Pinna illusion, Leaning tower illusion and Impossible World illusion
• Optical Illusions
• Optical Illusions
• Optical Illusions & Visual Phenomena

IQ Tests

• IQ Test
• IQ Test
• IQ Test
• IQ Tests ...An IQ in the range of 90 to 110 is considered average
• IQ Tests
• IQ Testing Lab
• Majon's Online IQ Test
• Puzz.com ...IQ tests, puzzles, games, trivia etc

Logic & Math Puzzles

• Conceptis Puzzles ...The home of logic puzzles
• Fun Logic Puzzles ...Some simple recreational logic puzzles. See if you can solve them!
• Interactive Mathematics Miscellany and Puzzles
• Logic Puzzles ...require no particular knowledge and can be solved using logic alone
• Math and Logic Problems Galore ...Word problems, puzzles, and ancient games like Nonograms to logic brain teasers
• Math Goodies Word Searches
• Jun 15 -Mathematical Puzzles ...The most entertaining, the most amusing, the most fun, the most paradoxical, and the most enjoyable puzzles
• Mathematical Puzzles ...for the mathematically adept
• Maths Puzzle
• Nick's Mathematical Puzzles
• Problem Corner
• Project Euler ...A series of challenging mathematical/computer programming problems
• Pythagorean Puzzle
• Smullyan Logic Puzzles ...Sampling of 5 puzzles
• The Hardest Logic Puzzle Ever ...see for yourself!
• Tricky Puzzles ...Mathematics is fun
• Wason Selection Task ...Four-card problem which is a logic puzzle
• Who keeps the Fish?
• 100 Interesting Mathematical Problems, Exercises, Puzzles, and Diversions

Mazes

• Caerdroia - Journal of Mazes and Labyrinths
• Click Mazes
• Great Mazes
• Jo Edkins' Maze Page
• Logic Mazes
• The Maze
• World Maze Database

Mensa

• Mensa
• Mensa Australia
• Mensa Canada
• Mensa Challenge
• Mensa Puzzles

Miscellaneous Sites

• Aenigmatica...a gymnasium for your Brain
• Auto Puzzles
• BrainsBreaker Online Jigsaws
• Card Trick Central
• Codebreaking and Secret Weapons in WWII
• Codes and Ciphers
• Cryptographs
• Decoding Nazi Secrets
• eCardTricks
• Edgar Allan Poe Cryptographic Cipher
• Encyclopedia of Integer Sequences
• Filmwise Invisibles
• JigZone
• JS Puzzles ...Free Jigsaw puzzles site, with a daily puzzle
• Mentat Wiki ...A collaborative environment for exploring ways to become a better thinker
• Pharaoh's Pump
• Rebus Club ...Magically makes a rebus of anything you type
• Riddles
• Secrets of the Mind
• The Great Enigma Challenge
• The Jerry Slocum Mechanical Puzzle Collection ...A lifetime pursuit of the intriguing and the perplexing
• The JigsawPuzzles ...Ever-growing collection of free online jigsaw puzzles
• The Problem Site

Puzzle Pages (cont)

• Lovatt's Online Puzzles...crosswords etc
• National Puzzlers' League
• Online Puzzles and Competitions ...Play our new range of online puzzles, hone your skills with our puzzle tutorials
• Pennypress Dell Magazines...Free puzzles and more every day
• Period.com Puzzles
• Ponder This
• Puzzability Puzzles
• Puzzle Crypt
• Puzzle Games ...Play Online Puzzle Games, Jigsaw Puzzles Games, Sudoku Puzzle Games and Popular Games in Your Free Time!
• Puzzle Maker ...Create and print customized word search, crossword and math puzzles
• Puzzle Pirates
• Puzzle Pointers
• Puzzle World
• Puzzler Archives
• Puzzles for the Avid Consumer
• Feb 04 -Puzzle Index ...Online puzzles
• Puzzles
• Puzzling Adventures: Sir Birnie's Will ...How a 14-year-old solved the mystery of an apparently miserly grandfather
• Sam Loyd's Cyclopedia of 5000 Puzzles
• Sam Loyd's Fifteen Puzzle
• The Cyclopedia of Puzzles
• The Einstein Puzzle
• The Grey Labyrinth
• The Puzzle Depot
• The Puzzle Society ...Games to maintain your brain
• The Puzzling World of Barry R. Clarke
• The Set Daily Puzzle ...And other various puzzles
• The Ultimate Puzzle Site
• Three Puzzles from Martin Gardner ...Here's a taste of the kinds of puzzles he was famous for bringing to the world
• Wei-Hwa's Puzzle Challenges
• What is it?...photo puzzles
• World Puzzle Championship History
• 123 Puzzle Games...freeware
• 2000 World Puzzle Championships Selections

Quizzes & Tests

• Art History Quiz
• Barbarian's Online Test Page
• Geometry Quizzes
• Instant Quizzes
• JetPunk ...Visit JetPunk for the world's best quizzes, with new quizzes released every day
• Jung Typology Test
• Personality Quiz
• Personality Test Center
• Psychology Tests
• Quiz Factor ...Fun, fascinating and free quiz site where you can test your knowledge and challenge your friends
• Quiz Hub
• Quizzes for All Ages
• Q4 Quiz ...Gateway to the ever expanding ocean of knowledge and trivia
• The Daily Quizshow
• The Google Maps Quiz
• World's Smallest Political Quiz
• 916 Test...good luck!

Rebus Puzzles

• Rebus Puzzles ...word picture puzzles

Rubik

• How to Solve a Rubik's Cube ...If you read this method, that's it, you will never have solved it thanks to your wits
• How to Solve the Rubik's Cube ...Make one twist and then make another
• Rubik Online
• Rubik's Cube
• Rubik’s Cube Solution
• Solving Rubik's Cube for Speed ...This is a tutorial for a method of solving Rubik's Cube

Sudoku

• Pi Day Sudoku Puzzle ... Fill in the grid so that each row, column, and jigsaw region contains 1-9 exactly once and ? three times
• Fiendish Sudoku

Trivia

• All Trivia Game
• Cascoly Online Trivia Games
• Fibonacci Numbers and the Golden Section
• Fun Trivia
• Highest Mountains
• Trivia
• Trivia Cafe
• Trivia Web
• 80's Trivia

Wooden Puzzles

• Mr Puzzle Australia
• MGC Wooden Jigsaw Puzzles ...custom made

Word Puzzles

• Crickler...puzzle
• John's Word Search Puzzles
• Metacrostics...from Arthur Bloch
• Quiz of the Week
• Online Word Search ...Online Word Search is a website where you can play word find games
• The Enigma Device
• Todays Encrypted Quote & Contest
• Word Puzzle Contests