Interactive Mathematics Miscellany and Puzzles - Java-based math resource including articles, puzzles and links.

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

Colorful Mathematics - Educational software presents advanced mathematical concepts to K-12 students in a game-oriented approach, using coloring and drawing techniques to illustrate state of the art mathematical concepts from graph theory and computer science.

Pythabacus - Description and methods of using the Pythagorean Abacus to teach arithmetic.

Mathwizz - Interactive math problems for abilities ranging from middle school to university.

Puzzles from Maths For Fun - Challenging number puzzles and activities, ideal for classroom use. Free samples on site.

Archive Creative puzzles - Interactive puzzle archive with descriptions for puzzle construction and a special childrens puzzle page.

MatheMagic - A collection of mathematical puzzles, jokes and articles.

Teaching Kids Math Playing Fun Educational Games - Online games for ages 0-14 with links to free resources.

Problems of the Week - Projects from the Math Forum presenting weekly interactive math challenges to accumulate points for bronze, silver and gold prizes. Individual or class participation.

mathschallenge.net - A website dedicated to the puzzling world of mathematics.

Math Forum - Resources, problems and forum for teachers and students in mathematics.

Shack's Math Problems - Over one hundred math problems ranging from basic math to differential equations.

Brain Teasers and Maths Puzzles - Interactive puzzles to challenge logical and mathematical skills with intermediate feedback and detailed solutions.

Problem of the Week - Mathematical contest site for all ages offering a calculator prize for the winner of each of five weekly challenges. Exclusive prizes for below grade 6 and grades 6-12.

Logicville - Educational puzzles, brain teasers, mathematical recreations and word games. A resource for anagrams, cryptograms, alphametics, word puzzles, logic problems, doublets, tangrams, chess, and math quizzes.

Quandaries and Queries - Forum for submission of school math problems for solution by math experts.

MatheMajik - Indian site featuring calculation tricks and math puzzles.

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

Algebra: Cut The Knot - Many puzzles using algebra and arithmetic reasoning. Most require java.

IQed! - Lateral puzzles from author Lloyd King

Polyhedra Links - Pastime and activity links for various geometric patterns, polygons and polyhedra by Jill Britton.

Torus and Klein Bottle Games - Collection of Java-based educational puzzles.

Macalester College Problem of the Week - Weekly math problem and archive from Professor Stan Wagon for first-year college students presented by the Math Forum.

A Base for Number Games - Resources for number games, books, brain teasers, kids educational puzzles and activities for learning mathematics.

The Puzzling World of Barry R. Clarke - Original free brain teasers, recreational mathematics articles and puzzles forum from Daily Telegraph (UK) compiler.

Mr Titen's More Than Math - Mathematics teacher provides puzzles for students.

Curious Numbers - A tribute to the lighter side of math including: puzzles, humor, trivia, quotes and inspirations, fun math links