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A+ Math Interactive math help for K-12 students with flashcards, Math Wordfind, Homework Helper and worksheets. http://www.aplusmath.com/
Aha! Puzzles Puzzles, books, games and tests with designed by Lloyd King, author of "Test Your Creative Thinking". http://www.ahapuzzles.com
AIMS Puzzle Corner Provides over 100 puzzles with the goal of creating an engaging learning environment. http://www.aimsedu.org/puzzle/
Algebraic Math Puzzles A collection of puzzles at high school level. Does not include answers. http://www.lifesmith.com/mathpuz1.html
Alien Tiles Object of puzzle is to try to get color pieces to create certain patterns in cube. http://www.alientiles.com/
Alphametic Puzzles Numerous puzzles, links, puzzle solver, and a generator. http://www.tkcs-collins.com/truman/alphamet/
Alphametics Page Compiled by Mike Keith. Examples of various genres. http://members.aol.com/s6sj7gt/mikealp.htm
Ben Robinson's Cross-Number Puzzles A collection of cross-number puzzles: similar to crosswords, but using digits instead of letters. Many involve complex mathematical reasoning. http://www.users.bigpond.com/bendr/xwd/numeric/index.html
Colorful Mathematics Educational software presents advanced mathematics to K-12 students in a game-oriented approach, using coloring and drawing techniques to illustrate concepts from graph theory and computer science. http://www.math.ucalgary.ca/~laf/colorful/colorful.html
The Contest Center Classic puzzles and riddles requiring only simple logic and elementary math. http://www.contestcen.com/classic.htm
Creative puzzles Interactive puzzle archive with descriptions for puzzle construction and a special children's puzzle page. http://www.creatievepuzzels.com/
Dick's Math Puzzle Page A collection of mathematical puzzles, some original, with fully worked solutions. http://www.mod2.org/
Free Puzzle Collections Educational and recreational puzzles for teachers, students and parents. Each puzzle is graded by difficulty and has a hint. Solutions are available to members. http://www.freepuzzles.com/
Group Games Animations that develop the theory behind such puzzles as the Rubik cube. http://www.dmi.units.it/~logar/duek2/index_engl.html
The Little Math Puzzle The Little Math Puzzle has been a K-12 Internet activity since 1995 for grades 5-9. Currently the puzzles have ceased but the site maintains complete archives of past problems. http://www.sprucelog.com/lmp/
Logic Puzzles Collection of original numerical-logic puzzles. Many are long and difficult, involve sorting and comparing long lists and are intended to be solved using a good spreadsheet program. http://www.geocities.com/bob_kraus_2000/
Logicville Educational puzzles, brain teasers, and word games such as anagrams, cryptograms, alphametics, doublets, tangrams. http://www.logicville.com/
Magic Math Kingdom Learn math through games and quiz-oriented tutorial. http://www.nes-lab.com/english2/
Math Puzzles Logic puzzles and riddles with some solutions. http://www.math.utah.edu/~cherk/puzzles.html
MatheMagic A collection of mathematical puzzles, jokes and articles. http://geocities.com/mathimoh/
MatheMajik Indian site featuring calculation tricks and math puzzles. http://mathemajik.tripod.com/
Mathematical Games A collection of pencil and paper games with mathematical content. Many can be played through the site. http://www.madras.fife.sch.uk/maths/games/
Mathproblems.info Over one hundred and fifty math problems ranging from basic math to differential equations. http://mathproblems.info/
Mathpuzzle.com Celebrates math puzzles and mathematical recreations. http://www.mathpuzzle.com/
Mathschallenge.net A website dedicated to the puzzling world of mathematics, with a discussion forum. http://mathschallenge.net/
Mathwizz Interactive math problems for abilities ranging from middle school to university. http://www.mathwizz.com/
Mixed Up Math Logic problems, where equations are mixed up. In various formats like boxes, crosses, diagonals, mazes. Free download. http://www.kprobe.com/kprobe/mu.htm
Mr Titen's More Than Math Mathematics teacher provides puzzles for students. http://www.geocities.com/EnchantedForest/Tower/1133/
Nandor's Exhaustive Chemical Words Pages Lists all the English words, word squares, and magic squares that can be written using chemical symbols. http://www.wellington.org/nandor/chemwords/chemwords.htm
Nick's Mathematical Puzzles A collection of puzzles, with hints, solutions, and links to related mathematical topics. http://www.qbyte.org/puzzles/
Paul Hsieh's Puzzles Logical and mathematical brain teasers, with an indication of difficulty. Hints are provided; solutions are available by email. http://www.azillionmonkeys.com/qed/puzzles.html
Perfect Times Teaches and assesses fluency of multiplication and division tables using online cards. Submit data and compare results. http://www.perfect-times.co.uk/
Polyhedra Links Pastime and activity links for various geometric patterns, polygons and polyhedra by Jill Britton. http://britton.disted.camosun.bc.ca/jbpolyhedra.htm
15 Puzzle of Sam Lloyd Play online Sam Lloyd's "15" puzzle. The funny story and mathematical implications of this game. Some funny logical problems with the 15 game. http://www.holotronix.com/samlloyd15.php
Puzzle of the Week Archives A collection of puzzles, with hints and full solutions. Compiled by George Moody. http://ecg.mit.edu/george/puzzles/
Pythabacus Description and instruction of using the ancient Pythagorean Abacus to do arithmetic. http://www.pythabacus.com/
Scott Kim Puzzles for web, computers, and print; ambigrams. http://www.scottkim.com/
Storkey: Two Envelope Paradox A tough but simply defined problem which demonstrates key issues in probability. http://homepages.inf.ed.ac.uk/amos/doubleswap.html
Wu's Riddles A collection of riddles, puzzles, and technical interview questions, with a discussion forum. http://www.ocf.berkeley.edu/~wwu/riddles/intro.shtml
XML Feeds :
Mathschallenge.net A website dedicated to the puzzling world of mathematics. [RSS] http://mathschallenge.net/rss2.xml
Nick's Mathematical Puzzles A collection of puzzles, with hints, solutions, and links to related mathematical topics. [RSS] http://www.qbyte.org/puzzles/rss2.xml