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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.
	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.
	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.

	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://homepages.inf.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 Monty Hall Problem - http://www.remote.org/frederik/projects/ziege/ A probability theory puzzle with solutions. [English and German.]
	CellFighter - http://www.cellfighter.com/conways-life-download.html Shareware game based around an extension of the game of life.

	Mathematical Jigsaw Puzzles - http://home.hetnet.nl/~paslen/jigsawpuzzles.html Information on polyominos and square puzzles.
	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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