I'm Bored! Puzzles to exercise your mind!

Crossword Puzzle Games
       This web site offers 32,400 free crossword puzzles and
       fun tools for people who enjoy word games. Get some
       help with a puzzle or create your own, free.

The Ultimate Puzzle Site
Basic puzzles, riddles, mathematical problems, brain teasers,
funny puzzles, and more!

Best Crosswords
The ultimate crossword puzzle site! Print them or work them online.

Etymologic
The toughest word game on the Web!

Jigsawland
Never lose another puzzle piece! Try some jigsaw puzzles online!
Quick, fun, and challenging!

Eluzions
       Puzzles encompass a wide variety of mental challenges, from
       crosswords to conundrums to jigsaws. They can be trivially easy,
       frustratingly hard, or anywhere in between. The greatest pleasure
       comes from those where the solution involves some novel way of
       thinking, or looking at the problem from an unexpected viewpoint.

Thinks.com
The brain games, puzzles and pastimes website.

The Grey Labyrinth
A collection of mindbenders, puzzles and paradoxes designed to
stimulate lateral thinking.

Hive-Mind
Mind Games and Puzzles.

Brain Juice
These are the type of puzzles that will drive you crazy until you
figure out the answer! Have fun!

Imagiware's Game Zone
       Try to leave one ball on the board with the Java Triangle Puzzle,
       find your way through a 3D rendered, multi-user virtual world in
       Nowwhere, Master Web is an ancient game of logic, unscramble
       an image at Web Puzzler, or play the African pit game of Mancala.

The Mystery Master
The greatest cyber-sleuth of all time, is devoted to that most
analytical of adventures, the solving of Logic Puzzles!

Crossword of the Day