- Brain Teasers and Math Puzzles
 - Interactive with immediate scoring. - curiouser.co.uk
- Offers paradoxical designs, puzzles, poems, and ideas.
- Cut the Knot
- Interactive mathematics miscellany and puzzles.
- Free Puzzles
- Offering geometry, logic, math, weight and other categories.
- FunBrain.com Math Baseball
- Players must answer math questions correctly to score runs in this baseball game.
- Little Math Puzzle Contest, The
- Open to all participants but designed for students in grades 5 through 10.
- Math Forum: K-12 Problems, Puzzles, Tips & Tricks
- Explore calculation tips, math problems, and math puzzles.
- Mathematical Games, Toys, and Puzzles
- Mathematical Knitting
- Knit your own Mobius Bands, projective planes, and Klein bottles.
- Mathematical Musings
- Puzzles with Euclid's proof, trisecting an angle, Lorentz Transformations, and more.
- Mathematics of the Rubik's Cube
- Mathick
- Offers interactive math lessons, exercises, and games. Learn to solve problems interactively, and get feedback on each step of your solution.
- Mathpuzzle.com
- Celebrates math puzzles and mathematical recreations.
- Mathwizz
- Problems and help for K-12, loan and mortgage calculators, and fun links.
- Nick's Mathematical Puzzles
- Collection of puzzles with hints, full solutions, and links to relevant mathematical topics.
- Olympiad Math Madness
- A collection of mathematical problems, invented for mathematical olympiads the world over.
- Playful Thoughts
- Recreational math problems.
- 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.
- 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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