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SadMan Software

Lots of information on Sudoku,

St. Olaf is a nationally ranked highly selective private liberal arts college of the Lutheran church in Northfield, Minnesota near Minneapolis and St. Paul

Learn Sudoku - How to solve any Sudoku

Intelligent Sudoku solvers, generators for all 3x3 Sudoku, 5-grid Samurai Sudoku and 4x4 Super Sudoku puzzles plus Daily Sudoku.

Instructables is the Biggest How To and DIY community where people make and share inspiring, entertaining, and useful projects, recipes, and hacks.

Free crossword puzzles and other puzzles and games to keep your brain fit, including sudoku puzzles, math puzzles and word searches to play online or print, as well as online jigsaw puzzles, logic puzzles, brain teasers, strategy games, puzzles for k...

Project homepage of HoDoKu - a sudoku generator/solver/analyzer written in Java

wikiHow is a wiki based collaboration to build the world’s largest, highest quality how to manual. Our multilingual how to manual has free step-by-step instructions on how to do all types of things.

Brain teasers, puzzles, online games, optical illusions and jigsaws.