Web Directory

» CellFighter
   Shareware game based around an extension of the game of life.
   http://www.cellfighter.com/conways-life-download.html

» IBM Research: Ponder This
   Monthly logic and math puzzles set by IBM researchers with solutions.
   http://domino.research.ibm.com/Comm/wwwr_ponder.nsf/pages/index.html

» Jim Loy's Puzzle Page
   Classic and original puzzles.
   http://www.jimloy.com/puzz/puzz.htm

» Leisure Ideas: Puzzles
   Some mathematical puzzles with answers and/or a hint.
   http://www.leisureideas.com/logic%20puzzles.htm

» Mathematical Jigsaw Puzzles
   Information on polyominos and square puzzles.
   http://home.kpn.nl/paslen/jigsawpuzzles.html

» 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.]
   http://montyhallgame.shawnolson.net/

» 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.
   http://perplexus.info/

» Quick Logic Puzzles
   Use the clues provided to deduce the correct sequence of numbers in the hidden code.
   http://www.robertwilliams.org/qlp/index.html

» TechInterview
   Answers to technical interview questions, programming problems, and brain teasers.
   http://www.techinterview.org/

» The Monty Hall Problem
   A probability theory puzzle with solutions. [English and German.]
   http://www.remote.org/frederik/projects/ziege/

» The Puzzles of Oscar
   Contains puzzles and games with solutions.
   http://world.altavista.com/babelfish/trurl_pagecontent?url=http%3A%2F%2Far.geocities.com%2Facertijososcar%2Facertijososcar.html&lp=es_en

» The Truth Tree's Math and Logic Board
   Collection of math and logic puzzles ranging in levels of difficulty.
   http://www.truthtree.com/mathdoor.html

» Two Envelope Paradox - Solution
   Claims that the two envelope paradox comes from the incorrect use of probabilities.
   http://homepages.inf.ed.ac.uk/amos/doubleswapsoln.html

» WU Forums
   Discussion board hosted at Berkeley with talk about a variety of solved and unsolved brain teasers.
   http://www.ocf.berkeley.edu/~wwu/cgi-bin/yabb/YaBB.cgi?board=riddles_hard