A+ Math - Interactive math help for K-12 students with flashcards, Math Wordfind, Homework Helper and worksheets.
Archive Creative puzzles - Interactive puzzle archive with descriptions for puzzle construction and a special childrens puzzle page.
Bradley University Problem of the Week - Weekly math problem and archive from Professor Alberto L. Delgado. Solutions are provided several weeks after the due date of the problem.
Brain Teasers and Maths Puzzles - Interactive puzzles to challenge logical and mathematical skills with intermediate feedback and detailed solutions.
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.
The Contest Center - Classic puzzles and riddles requiring only simple logic.
Curious Numbers - A tribute to the lighter side of math including puzzles, humor, trivia, quotes, inspirations, and interesting math links.
iQED! - Lateral puzzles from "Puzzles for the High IQ" author Lloyd King and founder of The Puzzle Wizards SiteRing.
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.
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.
Magic Math Kingdom - Designed for bringing joy to Math Study. Kids effectively learn math with friendly natural animals and/or worms, while a comprehensive game bring good stimulation.
Math Forum - Resources, problems and forum for teachers and students in mathematics.
MatheMagic - A collection of mathematical puzzles, jokes and articles.
MatheMajik - Indian site featuring calculation tricks and math puzzles.
Nick's Mathematical Puzzles - A collection of puzzles, with hints, solutions, and links to relevant mathematical topics.
Nikora's Puzzles - A set of puzzles and riddles, ranging from basic math to college level, with full solutions.
The Null Set - Puzzles collected by Guy Kindler, most requiring some undergraduate mathematical knowledge. Some hints are provided.
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.
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.
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.
Purdue University Problem of the Week - Challenging puzzles, some requiring undergraduate mathematical knowledge. Full solutions are provided several weeks after each problem is set.
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.
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 quizzes. Includes Java games.
Riddles - A collection of posers using logical reasoning or arithmetic skills to solve. Includes answers.
Shack's Math Problems - Over one hundred math problems ranging from basic math to differential equations.
