See also:

• Games: Puzzles  (692)

A+ Math  www.aplusmath.com Interactive math help for K-12 students with flashcards, Math Wordfind, Homework Helper and worksheets.

Aha! Puzzles  www.ahapuzzles.com Puzzles, books, games and tests with designed by Lloyd King, author of "Test Your Creative Thinking".

AIMS Puzzle Corner  www.aimsedu.org/puzzle Provides over 100 puzzles with the goal of creating an engaging learning environment.

Algebraic Math Puzzles  www.lifesmith.com/mathpuz1.html A collection of puzzles at high school level. Does not include answers.

Alien Tiles  www.alientiles.com Object of puzzle is to try to get color pieces to create certain patterns in cube.

Alphametic Puzzles  www.tkcs-collins.com/truman/alphamet Numerous puzzles, links, puzzle solver, and a generator.

Ben Robinson's Cross-Number Puzzles  www.users.bigpond.com/bendr/xwd/numeric/index.html A collection of cross-number puzzles: similar to crosswords, but using digits instead of letters. Many involve complex mathematical reasoning.

Brain Teasers and Maths Puzzles  www.syvum.com/teasers Interactive logical and mathematical puzzles with feedback and detailed solutions.

Brain Teasers by QBrute  www.angelfire.com/empire/qbrute Original brain teasers with solutions.

Calculus-Help Problem of the Week Archive  www.calculus-help.com/problem.html Calculus based problems range from easy to difficult.

Colorful Mathematics  www.math.ucalgary.ca/~laf/colorful/colorful.html 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.

The Contest Center  www.contestcen.com/classic.htm Classic puzzles and riddles requiring only simple logic and elementary math.

Contest Center Cryptarithms  www.contestcen.com/rithms.htm Examples of cryptarithms, with prize competitions for subscribers.

Creative puzzles  www.creatievepuzzels.com Interactive puzzle archive with descriptions for puzzle construction and a special children's puzzle page.

Dick's Math Puzzle Page  www.mod2.org A collection of mathematical puzzles, some original, with fully worked solutions.

Downloadable and online games  www.gameintellect.com A variety of Flash- and Java-based games and puzzles.

The Enigmatic World of Philip Carter  www.knowl.demon.co.uk Collection of brain teasers from the author of IQ books.

Free Puzzle Collections  www.freepuzzles.com Educational and recreational puzzles for teachers, students and parents. Each puzzle is graded by difficulty and has a hint. Solutions are available to members.

Group Games  www.dmi.units.it/~logar/duek2/index_engl.html Animations that develop the theory behind such puzzles as the Rubik cube.

Interactive Mathematics Miscellany and Puzzles  www.cut-the-knot.org Java-based math resource including articles, puzzles and links.

The Little Math Puzzle  www.sprucelog.com/lmp 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.

Logic Puzzles  www.geocities.com/bob_kraus_2000 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.

Logicville  www.logicville.com Educational puzzles, brain teasers, and word games such as anagrams, cryptograms, alphametics, doublets, tangrams.

Magic Math Kingdom  www.nes-lab.com/english2 Learn math through games and quiz-oriented tutorial.

Math Puzzles  www.math.utah.edu/~cherk/puzzles.html Logic puzzles and riddles with some solutions.

MatheMagic  geocities.com/mathimoh A collection of mathematical puzzles, jokes and articles.

MatheMajik  mathemajik.tripod.com Indian site featuring calculation tricks and math puzzles.

Mathematical Games  www.madras.fife.sch.uk/maths/games A collection of pencil and paper games with mathematical content. Many can be played through the site.

Mathematical Recreations  www.mathrec.org Detailed exploration of a selection of mathematical topics.

Mathproblems.info  mathproblems.info Over one hundred and fifty math problems ranging from basic math to differential equations.

Mathpuzzle.com  www.mathpuzzle.com Celebrates math puzzles and mathematical recreations.

Mathschallenge.net  mathschallenge.net A website dedicated to the puzzling world of mathematics, with a discussion forum.

Mathwizz  www.mathwizz.com Interactive math problems for abilities ranging from middle school to university.

Mixed Up Math  www.kprobe.com/kprobe/mu.htm Logic problems, where equations are mixed up. In various formats like boxes, crosses, diagonals, mazes. Free download.

Mr Titen's More Than Math  www.geocities.com/EnchantedForest/Tower/1133 Mathematics teacher provides puzzles for students.

Nandor's Exhaustive Chemical Words Pages  www.wellington.org/nandor/chemwords/chemwords.htm Lists all the English words, word squares, and magic squares that can be written using chemical symbols.

Nick's Mathematical Puzzles  www.qbyte.org/puzzles A collection of puzzles, with hints, solutions, and links to related mathematical topics.

Paul Hsieh's Puzzles  www.azillionmonkeys.com/qed/puzzles.html Logical and mathematical brain teasers, with an indication of difficulty. Hints are provided; solutions are available by email.

Perfect Times  www.perfect-times.co.uk Teaches and assesses fluency of multiplication and division tables using online cards. Submit data and compare results.

Polyhedra Links  britton.disted.camosun.bc.ca/jbpolyhedra.htm Pastime and activity links for various geometric patterns, polygons and polyhedra by Jill Britton.

Polymorf - Symmetry of Polyhedra  www.polymorf.net A demonstration of the symmetry and transformational properties of the Platonic and Archimedean solids.

A Primer on Cryptarithmetic  www.geocities.com/Athens/Agora/2160/primer.html Instructions, examples, references and links.

15 Puzzle of Sam Lloyd  www.holotronix.com/samlloyd15.php Play online Sam Lloyd's "15" puzzle. The funny story and mathematical implications of this game. Some funny logical problems with the 15 game.

Puzzle of the Week Archives  ecg.mit.edu/george/puzzles A collection of puzzles, with hints and full solutions. Compiled by George Moody.

The Puzzling World of Barry R. Clarke  barryispuzzled.com Brain teasers, articles and puzzles forum.

Pythabacus  www.pythabacus.com Description and instruction of using the ancient Pythagorean Abacus to do arithmetic.

Scott Kim  www.scottkim.com Puzzles for web, computers, and print; ambigrams.

Storkey: Two Envelope Paradox  homepages.inf.ed.ac.uk/amos/doubleswap.html A tough but simply defined problem which demonstrates key issues in probability.

Torus and Klein Bottle Games  www.geometrygames.org/TorusGames/index.html Collection of Java-based educational puzzles.

Wu's Riddles  www.ocf.berkeley.edu/~wwu/riddles/intro.shtml A collection of riddles, puzzles, and technical interview questions, with a discussion forum.

Mathschallenge.net  mathschallenge.net/rss2.xml A website dedicated to the puzzling world of mathematics. [RSS]

Nick's Mathematical Puzzles  www.qbyte.org/puzzles/rss2.xml A collection of puzzles, with hints, solutions, and links to related mathematical topics. [RSS]