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Mathematics software site with links to puzzles
Chartwell-Yorke mathematics software site with links to puzzles.
http://www.chartwellyorke.com/links.html
Logical and Mathematical Puzzles
Croco-Puzzle is a Company that produces puzzles and has a lot of free interactive puzzles available online.
http://www.croco-puzzle.com/en
ISAMA Directory: Mathematical Games and Puzzles
This list of links to sites about mathematical games and puzzles is part of the ISAMA online directory of Art, Mathematics and Architecture.
http://www.isama.org/puzzle/
Harold Reiter's Website
Problems and Puzzles related to Discrete Math and various pre-college math competitions.
http://://www.math.uncc.edu/~hbreiter/
Logical puzzles
Logical and mathematical puzzles, recreation math and IQ tests etc.
http://www.physics.muni.cz/~klepac/bookmarks.html
Simon Singh's Website
Writer, broadcaster and host of the BBC4 puzzle TV show Mind Games has sections on Fermat's Last Theorem, cryptography, puzzles, humour and his other work (e.g., articles, lectures and recommended books).
http://www.simonsingh.net
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/
IBM Research: Ponder This
Monthly logic and math puzzles set by IBM researchers with solutions.
http://www.research.ibm.com/ponder/
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
Jim Loy's Puzzle Page
Classic and original puzzles.
http://www.jimloy.com/puzz/puzz.htm
The Pyramid
Contains a collection of progressively more difficult problems. The more challenging problems require more than just mathematics to solve.
http://www.netquiz.com.sg/pyramid/challenge.html
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