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Jim Loy's Puzzle Page
Classic and original puzzles.
http://www.jimloy.com/puzz/puzz.htm
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
Dave's Logic Puzzles
Monthly logic puzzles with solving grids.
http://members.aol.com/dfcurran/logic/logicpuz.html
IBM Research: Ponder This
Monthly logic and math puzzles set by IBM researchers with solutions.
http://www.research.ibm.com/ponder/
Leisure Ideas: Puzzles
Some mathematical puzzles with answers and/or a hint.
http://www.leisureideas.com/puzzles.htm
TechInterview
Answers to technical interview questions, programming problems, and brain teasers.
http://www.techinterview.org/
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/
The Monty Hall Problem
A probability theory puzzle with solutions. [English and German.]
http://www.remote.org/frederik/projects/ziege/
CrocoPuzzle
Contains print-out and interactive versions. [English and German.]
http://www.croco-puzzle.com/en/
Mathematical Jigsaw Puzzles
Information on polyominos and square puzzles.
http://home.hetnet.nl/~paslen/jigsawpuzzles.html
The Eternity Puzzle
Article on how this difficult jigsaw puzzle was solved.
http://www.eternity-puzzle.co.uk/news.htm
The Two-Envelope Paradox: A Complete Analysis?
Describes aspects of a critical problem and apparent paradox in probability theory.
http://jamaica.u.arizona.edu/~chalmers/papers/envelope.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
Tangram Magic Egg
Tangram which creates hundreds of birds including geometry, tasks, solutions and downloads.
http://michael.bischoff.bei.t-online.de/index%20uk.htm
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