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Brain Teasers and Math Puzzles interactive with immediate scoring.	Curiouser and Curiouser... A website that offers paradoxical designs, puzzles, poems, and ideas.
FunBrain.com Math Baseball players must answer math questions correctly to score runs in this baseball game.	Interactive Mathematics Miscellany and Puzzles An encyclopedic collection of math resources for all grades. Arithmetic games, problems, puzzles, and articles
Little Math Puzzle Contest, The open to all participants but designed for students in grades 5 through 10.
Mathpuzzle.com Celebrates math puzzles and mathematical recreations.
Nick"s Mathematical Puzzles A collection of mathematical puzzles with hints and solutions.
Online Maths Tutor For 5-13yr Olds Whizz Education - Mathematics Tutor
Playful Thoughts Recreational math problems.
Problem Site, The provides math problems, brainteasers, and riddles online. These puzzles aid in developing problem solving and lateral thinking skills.	SpeedSolving the Rubik"s Cube - Speedsolving.com Wiki Learn about speedsolving the Rubik's Cube and other twisty puzzles on this wiki. Built to compliment our community of 35,000+ solvers, this wiki has tutorials, methods, records, and articles on puzzle solving.
thrackle.org dedicated to John Conway"s thrackle problem.