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Brain Teasers and Math Puzzles interactive with immediate scoring.
| curiouser.co.uk offers paradoxical designs, puzzles, poems, and ideas.
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Cut the Knot interactive mathematics miscellany and puzzles.
| Exercise Your Brain! riddles for undergraduates and novices in math.
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Free Puzzles offering geometry, logic, math, weight and other categories.
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FunBrain.com Math Baseball players must answer math questions correctly to score runs in this baseball game.
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Little Math Puzzle Contest, The open to all participants but designed for students in grades 5 through 10.
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Mathematical Musings puzzles with Euclid"s proof, trisecting an angle, Lorentz Transformations, and more.
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Mathematics of the Rubik"s Cube Mathematics of the Rubik"s Cube
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Mathpuzzle.com celebrates math puzzles and mathematical recreations.
| Mathwizz problems and help for K-12, loan and mortgage calculators, and fun links.
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Mr. Titen"s Math Page challenge problems for middle schoolers and math tricks to amaze and astound your friends and relatives.
| Nick"s Mathematical Puzzles collection of puzzles with hints, full solutions, and links to relevant mathematical topics.
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Olympiad Math Madness a collection of mathematical problems, invented for mathematical olympiads the world over.
| Playful Thoughts recreational math problems.
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Problem Corner mathematical problems and puzzles from the journal Matematika, presented by the problems column editor.
| Problem Site, The provides math problems, brainteasers, and riddles online. These puzzles aid in developing problem solving and lateral thinking skills.
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SCWeb4Free features math games, worksheets, and flash cards for middle school and elementary students.
| thrackle.org dedicated to John Conway"s thrackle problem.
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