- Dave's Logic Puzzles - http://members.aol.com/dfcurran/logic/logicpuz.html
Monthly logic puzzles with solving grids.
- IBM Research: Ponder This - http://www.research.ibm.com/ponder/
Monthly logic and math puzzles set by IBM researchers with solutions.
- TechInterview - http://www.techinterview.org/
Answers to technical interview questions, programming problems, and brain teasers.
- Perplexus - http://perplexus.info/
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.
- The Monty Hall Problem - http://www.remote.org/frederik/projects/ziege/
A probability theory puzzle with solutions. [English and German.]
- WU Forums - http://www.ocf.berkeley.edu/~wwu/cgi-bin/yabb/YaBB.cgi?board=riddles_hard
Discussion board hosted at Berkeley with talk about a variety of solved and unsolved brain teasers.
- Two Envelope Paradox - Solution - http://www.anc.ed.ac.uk/~amos/doubleswapsoln.html
Claims that the two envelope paradox comes from the incorrect use of probabilities.
- Quick Logic Puzzles - http://www.robertwilliams.org/qlp/index.html
Use the clues provided to deduce the correct sequence of numbers in the hidden code.
- The Puzzles of Oscar - http://uk.geocities.com/oscarlagioia/riddles.html
Contains puzzles and games with solutions.
- Monty Hall Game - http://montyhallgame.shawnolson.net/
JavaScript example of the Monty Hall Game. This game demonstrates the real (empirical) affect of statistics. [Does not display correctly in all browsers.]
- Leisure Ideas: Puzzles - http://www.leisureideas.com/logic%20puzzles.htm
Some mathematical puzzles with answers and/or a hint.
- CellFighter - http://www.cellfighter.com/conways-life-download.html
Shareware game based around an extension of the game of life.
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