Games & Brain Ticklers
Puzzles
20 Questions - The program is very simple but its behavior is complex. Everything that it knows and all questions that it asks were entered by people playing this game.
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.
All Star Puzzles - cryptograms - fun.
Arichmedes' Lab - Recreational mathematics including puzzles to make and solve, tessellations, geometric puzzles, optical illusions, and curiosities.
Between Waters - some old time favorites and others new. You'll like the simplicity of this site.
Bored? Here's Confusion - Its a challenge to reach the end of this puzzle maze.
Brain Bashers - a collection of brain teasers, puzzles, riddles, games and optical illusions. They have thousands of brain teasers and puzzles, over one hundred awards and millions of visitors per year.
Click Mazes - Lots of unique interactive puzzles and mazes found here, and a few other things besides.
Cryptoquote - solve the puzzle and read the quote. Daily.
Exploratorium - very cool illusions.
Eye Tricks - source for optical illusions, brain teasers, games, 3D images and other mind teasing oddities.
Grey Labyrinth - collection of puzzles, riddles, and paradoxes. Features a changing "unsolved puzzle" plus three years worth of previous puzzles.
Harder Riddles - Riddles, puzzles and brain teasers to challenge and entertain all ages.
Labyrinths - This includes creating them, solving them, sharing with other enthusiasts, and most everything else.
Logic Games - interactive games.
Mazes - maze-lover, you've come to the right place.
Online Games, Puzzles and Illusions - Featuring all sorts of games, optical illusions, puzzles, trivia, mazes, and magic tricks. Suitable for all ages.
Optical Illusions and Visual Phenomena - some great visual and optical illusions. Try it out!
Ponder This - by IBM. You are cordially invited to match wits with some of the best minds in IBM Research.
Puzzle Depot - challenges your brain with free puzzles, Shockwave and Flash games, crosswords, logic games, IQ tests, trivia games and contests for prizes.
Self Referential Sentences - Exhaustive lists of "This sentence has three a's" sentences.
Self-Referential Sentences Puzzle - The object of this difficult puzzle is to make four sentences mutually truthful by filling in base three numbers.
The Stone - The Stone is your key to a world where the puzzles are alive and the players gather their secrets.
Sure Shot Riddles - A fun and challenging collection of logic riddles and sequences.
Tetris - 3D game, free
Truth Tree's Math - solve these problems and compete with other visitors to The Truth Tree.
WordPlays - crosswords, anagrams, word jumbles, pig latin, etc.
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