- Cryptograms(3)
- Mathematical(5)
- Nonograms(1)
- Optical Illusions(9)
- Riddles(8)
- Sudoku(39)
- ad The Logic Zone
- thelogiczone.plus.com
- Collection of logic problems, logic puzzles and cryptograms with answers. Graded levels of difficulty including some especially for kids.
- Braingle
- www.braingle.com
- 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.
5.0
(7)
>720
>190
4
- BrainBashers
- www.brainbashers.com
- Brain teasers, puzzles, riddles, games and optical illusions.
4.2
(si*)
>880
>30
5
- Brain Teasers
- brainden.com
- Brain teasers, riddles, logic puzzles and problems, paradoxes, optical illusions, IQ tests and logical games.
4.2
(si*)
>1040
>420
4
- Archimedes' Laboratory
- www.archimedes-lab.org
- Recreational mathematics including puzzles to make and solve, tessellations, geometric puzzles, optical illusions, and curiosities.
4.0
(1)
>220
>10
5
- National Puzzlers' League
- www.puzzlers.org
- Crosswords and other word puzzles and games, samples; monthly puzzle magazine; 800,000 word searchable list.
3.8
(si*)
>30
<5
5
- Just Riddles and More
- www.justriddlesandmore.com
- Riddles, trivia, illusions, puzzles, and brain teasers.
3.8
(si*)
>50
<10
4
- The Grey Labyrinth
- www.greylabyrinth.com
- A beautifully illustrated collection of puzzles, riddles, and paradoxes. Features a changing "unsolved puzzle" plus three years worth of previous puzzles.
3.8
(si*)
>20
<5
5
- Had To Play On
- www.hadtoplayon.com
- A community based site with competitions, challenges, awards, a help centre, forums and games.
3.8
(si*)
>10
<5
3
- Thinks.com
- www.thinks.com
- Recreations for active minds including games, puzzles, math, words, images, books, software and web guide.
3.7
(si*)
>30
>20
5
- Puzzability
- www.puzzability.com
- Some real mind benders here.
3.7
(si*)
>20
-
5
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