Easy, medium and difficult brain teasers without answers.
All-Star Puzzles: Logic Problems
Collection of logic problems to solve. Printable.
Recreational mathematics including puzzles to make and solve, tessellations, geometric puzzles, optical illusions, and curiosities.
Bill's Brain Teasers
A collection of visual and linguistic riddles.
Brain teasers, riddles, logic puzzles and problems, paradoxes, optical illusions, IQ tests and logical games.
Brain teasers, puzzles, riddles, games and optical illusions.
A collection of math, logic, and word puzzles.
Includes a huge collection of user submitted and rated brain teasers and riddles. It also has a message board and some unique multi-player games.
Paradoxes, puzzles, games, optical illusions, poetry, curious facts, and quotations.
Eyetricks: Brain Teasers
Weekly puzzles and archives.
Gray Watson's Brain Teasers and Riddles
A collection of brain teasers and riddles with a guess button.
Had To Play On
A community based site with competitions, challenges, awards, a help centre, forums and games.
National Puzzlers' League
Crosswords and other word puzzles and games, samples; monthly puzzle magazine; 800,000 word searchable list.
Over 60 brain teasers to enhance your mind.
An on-line puzzle story in twelve weekly installments.
Have fun with games, puzzles, brainteasers and humor as you learn about logic and analysis.
Some real mind benders here.
Puzzle Contest Center
Riddles, brainteasers, cryptograms, anagrams, and logic puzzles. Compete in eight new contests monthly.
Puzzles & Computer
Pascal Huybers presents information about a variety of different puzzles.
Puzzles Without Rules
Free, updated, original abstract puzzles for advanced puzzle-solvers. Includes current unsolved puzzle and archive with hints and solutions.
A collection of logic puzzles, riddles and brain teasers.
An archive of many popular puzzles from the rec.puzzles newsgroup.
Say What You See!
Collection of visual brain teasers which can be solved by saying what you see.
Answers to technical interview questions, programming problems, and brain teasers.
The Grey Labyrinth
A beautifully illustrated collection of puzzles, riddles, and paradoxes. Features a changing "unsolved puzzle" plus three years worth of previous puzzles.
The Logic Zone
Collection of logic problems, logic puzzles and cryptograms with answers. Graded levels of difficulty including some especially for kids.
Recreations for active minds including games, puzzles, math, words, images, books, software and web guide.
Word puzzles, riddles, rebuses, brain teasers, mazes, cliparts and pictures.
Collection of puzzles including riddles, logic puzzles and sequential puzzles.
Challenge your mind with free online riddles/puzzles, logic games, brain teasers and view optical illusions.