- A Game A Day
- Collection of educational and entertaining puzzles for children.
- Able2Know
- Compiles fan-made riddles and brain teasers of various genres.
- Abnorm's Conundrums
- Collates various brain teasers of different level levels that have no definite answers.
- All-Star Puzzles: Logic Problems
- Features printable logical problems. Puzzles are arranged alphabetically, difficulty, and popularity.
- The Amazing Art Site
- Archives collections of optical illusions, hidden images, and ambiguous art.
- Archimedes' Lab
- Offers a variety of brain teasers, optical illusions, e-books, and games available for play online.
- AVAV
- Features links to different optical illusions, brain teasers, and riddles. Also presents resources.
- Bill's Brain Teasers
- Provides several brain teasers along with their answers.
- Brain Juice
- Presents different puzzles with solutions and difficulty indicators.
- Brain Teaser World
- Features a collection of optical illusions,riddles,puzzles, and brain teasers.
- Brain Teasers
- Presents a collection of riddles, geometrical problems, mathematical paradoxes, and optical illusions.
- Brain Teasers from PedagoNet
- Large collection of brain teasers complete with solutions.
- BrainBall
- Features different games to assess thinking and logical skills. Provides statistical reports.
- BrainBashers
- Collection of brain teasers, puzzles, riddles, games and optical illusions.
- BrainBoggled!
- Includes brain teasers, logic puzzles, math riddles, and more.
- Braingle
- Offers a collection of brain teasers with a featured daily riddle, online games, and member message boards.
- BrainVista
- Discusses unsolved puzzles and riddles. Arranged by type, level, and posted date.
- Confusion
- Features a puzzle with 6 levels to measure thinking skills and logical abilities.
- The Contest Center
- Offers cash prizes for solving brain teasers and puzzles.
- Curiouser.co.uk
- Showcases paradoxes, illusions, and trivia collections.
- Eluzions
- Features assorted puzzle games, optical illusions, and trivia collections on various categories.
- Eyetricks: Brain Teasers
- Archives of brain teasers, puzzles, and IQ tests.
- Gray Watson's Brain Teasers and Riddles
- Provides solutions and randomization features of the puzzle collections.
- The Grey Labyrinth
- Showcases the illustrations of puzzles, riddles, and paradoxes. Also provides gaming resources and solutions.
- Sudoku Puzzles For Beginners
- Collection of printable puzzles, ranging from easy to extremely difficult.
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