Brain Teasers
- 21
- iRIDDLER
- Challenge your mind with free online riddles/puzzles, logic games, brain teasers and view optical illusions.
- 22
- All-Star Puzzles' Cryptograms
- Daily problems with browser based solver. The author's name is hidden in the cipher alphabet. [Requires Java]
- 23
- Between Waters
- Daily problems and solutions available with or without interactive browser-based solver.
- 25
- Cryptogram Solver Source Code
- Source code archive with several programs to automatically solve puzzles. Also includes "crypo-quote" of the day.
- 26
- Cryptogrammaton
- Ancient Greek mythological themes. Solutions listed separately, along with stories about the mythical characters in the puzzle.
- 27
- Letter Frequency and Word Frequency in the English Language
- Has the statistics for various types of writings(Press, Religious, Scientific), position in the word(first, second, third, last), and digraphs.
- 28
- OneAcross - Cryptograms
- Solving tool through web browser. Allows entry of a phrase, or selection from "easy, medium, or hard" quotations taken from the Linux fortune collection. Also features the ability to send cryptogram-encoded messages via email.
- 29
- Puzz.com: Cryptograms
- Ten problems with solutions taken from famous sayings, adages, and proverbs. By William F. Bultas.
- 32
- Monty Hall Game
- JavaScript example of the Monty Hall Game. This game demonstrates the real (empirical) affect of statistics. [Does not display correctly in all browsers.]
- 33
- Perplexus
- A forum and collection of brain teasers, logic problems, math problems, paradoxes, science games, probability, riddles, and geometric shapes. The puzzles are searchable and categorized, most have solutions.
- 34
- Quick Logic Puzzles
- Use the clues provided to deduce the correct sequence of numbers in the hidden code.
- 36
- Two Envelope Paradox - Solution
- Claims that the two envelope paradox comes from the incorrect use of probabilities.
- 37
- WU Forums
- Discussion board hosted at Berkeley with talk about a variety of solved and unsolved brain teasers.
- 38
- Conceptis Puzzles
- Creator and supplier of picture-forming logic puzzles. Contains online games and those for sale from Japan.