.
- About.com: Math Puzzles
- Age of Puzzles
- AIMS puzzle corner
- Alexander Shapovalov and river crossing puzzles
- Brain Food
- Brain Fun
- Brainbashers
- Brainden
- Braingle
- brainyplanet
- Car Talk Puzzler
- Cool math 4 kids
- CRUX Mathematicorum
- Cut the knot
- Cyclopedia of puzzles - Sam loyd
- Dr. Math
- Free Puzzles
- Futility Closet
- Geeks for geeks
- Guardian: Alex Bellos' Monday puzzle
- Guardian: Alex Bellos's Adventures in Numberland
- Genius Puzzles
- Hit Bulls Eye
- i09 Sunday Puzzle
- IMO
- Jacob Lance
- Jim Loy's Puzzle Page
- Ken's Puzzles
- Knights and Knaves
- Logic Puzzles
- Logical Problems
- Math Forum
- Math is fun
- Math problems info
- Math puzzles by Andrej and Elena
- MathPuzzle.com and other links
- Mathematical Puzzles
- Mathematics is Fun
- Mind your decisions
- Nick's Mathematical Puzzles
- Nigel Coldwell
- NSA's Puzzle Periodical
- Numericana final answers
- Passion for puzzles
- Parade.com
- Pzzls
- PuzzlersWorld
- Puzzlefry
- puzzling stackexchange
- Rebus Pictograms
- Riddles
- Samuel Loyd
- Syvum
- Spirit of Genius
- Tanya Khovanova puzzle blog
- The Ultimate Puzzle Site
- Transum Math Puzzles
- Treeknox
- International Mathematics Tournament of the Towns
- Tournaments of Towns Toronto Problems and Solutions
- University of Kent
- Wendell World
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