| Archimedes\'_Laboratory Recreational mathematics including puzzles to make and solve, tessellations, geometric puzzles, optical illusions, and curiosities. |
| AVAV Collection of optical illusions, brain teasers and riddles. |
| Bill\'s_Brain_Teasers A collection of visual and linguistic riddles. |
| Brain_Juice An assortment of entertaining logic puzzles with solutions and indicated levels of difficulties. |
| Brain_Teaser_World Offers riddles, puzzles, optical illusions, and magic tricks. |
| Brain_Teasers Brain teasers, riddles, logic puzzles and problems, paradoxes, optical illusions, IQ tests and logical games. |
| BrainBall A daily brain puzzle with 10 different tasks and a variety of statistics on your performance. |
| BrainBashers Brain teasers, puzzles, riddles, games and optical illusions. |
| BrainBoggled_com A collection of math, logic, and word puzzles. |
| Braingle_-_Brain_Teasers_&_Riddles Contains a huge collection of user submitted and rated brain teasers and riddles. It also has a lively message board and some unique multiplayer games. |
| BrainVista Collection of solved and unsolved brain teasers. |
| Confusion Its a challenge to reach the end of this puzzle maze. |
| Curiouser_co_uk Paradoxes, puzzles, games, optical illusions, poetry, curious facts, and quotations. |
| Eluzions Featuring all sorts of games, optical illusions, puzzles, trivia, mazes, and magic tricks. Suitable for all ages. |
| Eye-Pleasing,_Mind-Teasing_3-D_Conundrums Scans from a book of puzzles, includes English translations. |
| Eyetricks__Brain_Teasers Weekly puzzles and archives. |
| 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. |
| Game-Master\'s_Page Riddles, games, cryprograms, math puzzles, and forums. |
| Gray_Watson\'s_Brain_Teasers_and_Riddles A collection of brain teasers and riddles with a guess button. |
| The_Grey_Labyrinth A beautifully illustrated collection of puzzles, riddles, and paradoxes. Features a changing "unsolved puzzle" plus three years worth of previous puzzles. |
| Had_To_Play_On A community based site with competitions, challenges, awards, a help centre, forums and games. |
| iRIDDLER Challenge your mind with free online riddles/puzzles, logic games, brain teasers and view optical illusions. |
| Just_Riddles_and_More Riddles, illusions, puzzles, and brain teasers. |
| Logic_Puzzles_Escapades Logic puzzles with a satirical New Zealand tone. |
| The_Logic_Zone Collection of problems with answers, logic puzzles and cryptograms. |
| National_Puzzlers\'_League Crosswords & other word puzzles and games, samples; monthly puzzle magazine; 800,000 word searchable list. |
| PedagoNet_Brainers Over 60 brain teasers to enhance your mind. |
| Planetarium An on-line puzzle story in twelve weekly installments. |
| Professor_Tangent Have fun with games, puzzles, brainteasers and humor as you learn about logic and analysis. |
| Puzzability Some real mind benders here. |
| Puzzle_Contest_Center Riddles, brainteasers, cryptograms, anagrams, and logic puzzles. Compete in eight new contests monthly. |
| A_Puzzlemakers_Site Puzzles of all descriptions. |
| Puzzles_Without_Rules Free, updated, original abstract puzzles for advanced puzzle-solvesr. Includes current unsolved puzzle and archive with hints and solutions. |
| Pzzls A collection of logic puzzles, riddles and brain teasers. |
| Rec_puzzles_Archive An archive of many popular puzzles from the rec.puzzles newsgroup. |
| Roh\'El\'s_Riddles Offers brainteasers rated by difficulty and category. |
| Say_What_You_See! Collection of visual brain teasers which can be solved by saying what you see. |
| Sesquip_Word_Games Challenging word games published in newspapers. |
| Shashi\'s_Homepage Collection of puzzles, riddles and brain teasers. |
| The_Stone an online mystery game. Hours of clever puzzles and riddles. Puzzles challenge the mind of serious and amateur players worldwide. |