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    Science > Math > Recreations > Games and Puzzles  (74)

Web Pages

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	IBM Research: Ponder This - http://domino.research.ibm.com/Comm/wwwr_ponder.nsf/pages/index.html 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.
	Jim Loy's Puzzle Page - http://www.jimloy.com/puzz/puzz.htm Classic and original puzzles.
	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 Truth Tree's Math and Logic Board - http://www.truthtree.com/mathdoor.html Collection of math and logic puzzles ranging in levels of difficulty.

	Kakuro-san - http://www.kakurosan.com Providing graded Kakuro puzzles every day, plus old puzzles.
	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.
	CellFighter - http://www.cellfighter.com/conways-life-download.html Shareware game based around an extension of the game of life.
	Two Envelope Paradox - Solution - http://homepages.inf.ed.ac.uk/amos/doubleswapsoln.html Claims that the two envelope paradox comes from the incorrect use of probabilities.
	The Monty Hall Problem - http://www.remote.org/frederik/projects/ziege/ A probability theory puzzle with solutions. [English and German.]

	Mathematical Jigsaw Puzzles - http://home.hetnet.nl/~paslen/jigsawpuzzles.html Information on polyominos and square puzzles.
	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.
	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.
	The Puzzles of Oscar - http://world.altavista.com/babelfish/trurl_pagecontent?url=http%3A%2F%2Far.geocities.com%2Facertijososcar%2Facertijososcar.html&lp=es_en Contains puzzles and games with solutions.

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