- curiouser.co.uk - offers paradoxical designs, puzzles, poems, and ideas.
- Nick's Mathematical Puzzles - collection of puzzles with hints, full solutions, and links to relevant mathematical topics.
- FunBrain.com Math Baseball - players must answer math questions correctly to score runs in this baseball game.
- Mathwizz - problems and help for K-12, loan and mortgage calculators, and fun links.
- Exercise Your Brain! - riddles for undergraduates and novices in math.
- Free Puzzles - offering geometry, logic, math, weight and other categories.
- Little Math Puzzle Contest, The - open to all participants but designed for students in grades 5 through 10.
- Playful Thoughts - recreational math problems.
- Mathematical Games, Toys, and Puzzles -
- Brain Teasers and Math Puzzles - interactive with immediate scoring.
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