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 and elementary math..
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..
The Little Math Puzzle - 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..
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 Puzzles - Logic puzzles and riddles with some solutions..
MatheMajik - Indian site featuring calculation tricks and math puzzles..
Mathematical Games - A collection of pencil and paper games with mathematical content. Many can be played through the site..
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..