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• 15 Puzzle of Sam Lloyd: Play online Sam Lloyd's "15" puzzle The funny story of this game Mathematical implications of this game Some funny logical problems with the 15 game.
• A Primer on Cryptarithmetic: Instructions, examples, references and links.
• A+ Math: Interactive math help for K-12 students with flashcards, Math Wordfind, Homework Helper and worksheets.
• Aha! Puzzles: Puzzles, books, games and tests with designed by Lloyd King, author of "Test Your Creative Thinking".
• Algebraic Math Puzzles: A collection of puzzles at high school level. Does not include answers.
• Alien Tiles: Object of puzzle is to try to get color pieces to create certain patterns in cube.
• Alphametic Puzzles: Numerous puzzles, links, puzzle solver, and a generator.
• Alphametics Page: Compiled by Mike Keith. Examples of various genres.
• Alphametics and Cryptarithms: Puzzles in which letters or symbols are substituted for the digits in an arithmetical operation like addition.
• Archive Creative puzzles: Interactive puzzle archive with descriptions for puzzle construction and a special childrens puzzle page.
• BCIT Mathematical Entertainment: Famous mathematical problems, puzzles, facts, games and trivia.
• Brain Teasers and Maths Puzzles: Interactive logical and mathematical puzzles with feedback and detailed solutions.
• Brain Teasers by QBrute: Original brain teasers with solutions.
• Clever Games for Clever People: Games that interest John Conway including Rim and Traffic Jam.
• 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.
• Contest Center Cryptarithms: Examples of cryptarithms, with prize competitions for subscribers.
• 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.
• Group Games: Animations that develop the theory behind such puzzles as the Rubik cube.
• Interactive Mathematics Miscellany and Puzzles: Java-based math `resource` including articles, puzzles and links.
• Ken Duisenberg's Puzzle of the Week Archives: Challenging puzzles and problems.
• 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.
• Logicville: Educational puzzles, brain teasers, and word games such as anagrams, cryptograms, alphametics, doublets, tangrams.
• Magic Math Kingdom: Learn math through games and quiz-oriented tutorial.
• Math Forum: Resources, problems and forum for teachers and students in mathematics.
• Math Puzzles: Logic puzzles and riddles with some solutions.
• MatheMagic: A collection of mathematical puzzles, jokes and articles.
• MatheMajik: Indian site featuring calculation tricks and math puzzles.
• Mathematical Recreations: Detailed exploration of a selection of mathematical topics.
• Mathproblems.info: Over one hundred and fifty math problems ranging from basic math to differential equations.
• Mathpuzzle.com: Celebrates math puzzles and mathematical recreations.
• Mathschallenge.net: A website dedicated to the puzzling world of mathematics and computer programming.
• Mathwizz: Interactive math problems for abilities ranging from middle school to university.
• Mixed Up Math: Logic problems, where equations are mixed up. In various formats like boxes, crosses, diagonals, mazes. Free download.
• Mr Titen's More Than Math: Mathematics teacher provides puzzles for students.
• Nick's Mathematical Puzzles: A collection of puzzles, with hints, solutions, and links to relevant mathematical topics.
• Paul Hsieh's Puzzles: Logical and mathematical brain teasers, with an indication of difficulty. Hints are provided; solutions are available by email.
• Perfect Times: Teaches and assesses fluency of multiplication and division tables using online cards. Submit data and compare results.
• Polyhedra Links: Pastime and activity links for various geometric patterns, polygons and polyhedra by Jill Britton.
• Polymorf - Symmetry of Polyhedra: A demonstration of the symmetry and transformational properties of the Platonic and Archimedean solids.
• Pythabacus: Description and instruction of using the ancient Pythagorean Abacus to do arithmetic.
• Quia! Mathematics Activities: Educational activities for teaching mathematics including concentration, matching, flash cards, word search puzzles, and Java games.
• Riddles: A collection of riddles and logic puzzles with solutions.
• SMSU Problem Corner: Math challenges Southwest Missouri State University in three levels of difficulties.
• Scott Kim: Puzzles for web, computers, and print; ambigrams.
• Sequence Puzzles and Problems: With links to related sites. Compiled by Torsten Sillke.
• Storkey: Two Envelope Paradox: A tough but simply defined problem which demonstrates key issues in probability.
• The Contest Center: Classic puzzles and riddles requiring only simple logic and elementary math.
• The Enigmatic World of Philip Carter: Collection of brain teasers from the author of IQ books.
• The Null Set: Puzzles collected by Guy Kindler, most requiring some undergraduate mathematical knowledge. Some hints are provided.
• The Puzzling World of Barry R. Clarke: Brain teasers, articles and puzzles forum.
• Tile Tris: Tile a spheroid working room aperiodically or periodically. Includes free demo download.
• Torus and Klein Bottle Games: Collection of Java-based educational puzzles.
• Wu's Riddles: A collection of riddles, puzzles, and technical interview questions, with a discussion forum.
• iQED!: Lateral puzzles from "Puzzles for the High IQ" author Lloyd King and founder of The Puzzle Wizards SiteRing.

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