Archimedes' lab
Puzzle Website
Aunty Math
Math Challenges for K-5 Learners
Brain Teasers
Houghton Mifflin Company
Brain Teasers and Math Puzzles
Brain Teasers Math Puzzles syvum
Centre for Innovation in Mathematics Teaching - Puzzle Index
Centre Innovation Mathematics Teaching Puzzle Index info
Creative Puzzles
Gijsbert van Uden
Davids puzzle pagina
David Dirkse
De Ultieme Puzzel Pagina's
Rob van Gassel Jurgen Heijmans Edwin Veldhoven
Erich's Puzzle Palace
Erich Friedman
Interactive Mathematics Miscellany and Puzzles
Alexander Bogomolny
Ken Duisenberg's Puzzle of the Week
Ken Duisenberg
Knobel-Ecke
Mathe-Treff der Bezirksregierung Düsseldorf
Logische puzzles
Willem Pijnappel
Mathematical Puzzles
Handley Math
Mathematics Problems and Warm-ups
interesting mathematics problems for classrooms or just fun - Lori Thomson
Mathpuzzle.com
Ed Pegg
MathsNet Puzzles
A selection of puzzles various kinds
Nick's Mathematical Puzzles
Nick Hobson
nrich
University of Cambridge
Pentomino-site
Odette De Meulemeester
Puzzels
Vierkant voor Wiskunde
Puzzeltjes
puzzelpagina van de Wageningse Methode
Puzzeltjes
Roelof Oosterhuis
Puzzle World
John Rausch
Puzzles by Sam Loyd
Puzzles Sam Loyd thinks
Puzzles!
Brandom McPhail
Puzzles.COM
Thinkfun
Raadsels en puzzels
Goewan Wiecherink
rdzl
rdzl raadsels en puzzels
Rubik's Online Home Page
official site
Sam Loyd's Cyclopedia of Puzzles
5000 and Conundrums
Sam Loyd's fifteen
cut-the-knot
Solving sudokus
Andries Brouwer
Su | do | ku
Pappocin
Sudoku
Wikipedia
Sudoku
Wikipedia
Sudoku : MiniSudoku
Jacob Ras
Sudoku Net
Sudoku's en wiskunde
Klaas Pieter Hart
Sudoku’s en Wiskunde (presentatie NWD)
Klaas Pieter Hart
Tetrahedral Puzzles
Science U Geometry Center
The Grand Mini's Wiskunde Puzzels
enige wiskunde puzzels
The Puzzling World of Polyhedral Dissections
Stewart Coffin
The rec.puzzles Archive
archief van de discussiegroep rec.puzzles
Wiskundepuzzels
R v d Wurff