| • | 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 and Cryptarithms - Puzzles in which letters or symbols are substituted for the digits in an arithmetical operation like addition. |
| • | Alphametics Page - Compiled by Mike Keith. Examples of various genres. |
| • | 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. |
| • | 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. |
| • | 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. |
| • | Curious Numbers - A tribute to the lighter side of math including puzzles, humor, trivia, quotes, inspirations, and math links. |
| • | 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. |
| • | iQED! - Lateral puzzles from "Puzzles for the High IQ" author Lloyd King and founder of The Puzzle Wizards SiteRing. |
| • | 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. |
| • | 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 related mathematical topics. |
| • | Nick's Mathematical Puzzles - A collection of puzzles, with hints, solutions, and links to related 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. |
| • | Puzzle of the Week Archives - A collection of puzzles, with hints and full solutions. Compiled by George Moody. |
| • | Puzzles of Leonid Mochalov - A variety of challenging geometrical and arithmetical puzzles, many with solutions. |
| • | Pythabacus - Description and instruction of using the ancient Pythagorean Abacus to do arithmetic. |
| • | Scott Kim - Puzzles for web, computers, and print; ambigrams. |
| • | Sequence Puzzles and Problems - With links to related sites. Compiled by Torsten Sillke. |
| • | SMSU Problem Corner - Math challenges Southwest Missouri State University in three levels of difficulties. |
| • | 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. |
