## Sudoku Links

Google reported 33'300'000 hits for "Sudoku" in March 2010 and 44'400'000 hits in December 2015. I liked the pages below (as of 2015, the ordering is arbitrary). You will surely find many more Sudoku sites on the Internet.- Wikipedia: Sudoku
- All about Sudoku.
- Wikipedia: Mathematics of Sudoku
- A good Wikipedia paper, as usual.
- Wikipedia: Algorithmics of Sudoku
- Computer solution methods without logic (e.g. backtracking).
- Angus Johnson: Simple Sudoku
- Sudoku hints and a program.
- Tom Davis: The Mathematics of Sudoku (PDF)
- Sudoku rules and mathematical explanations.
- Frazer Jarvis: Sudoku enumeration problems
- Counting Sudoku positions.
- Sudoku Dragon
- A very extensive page with everything about Sudoku. It includes playing, solving of a given board, generating, explaining solution techniques and much more.
- Sourendu Gupta: Sudoku
- A nice page with a lot of material and background information.
- David J. Nixon: Sudoku Hints
- Online game and a possibility to add Sudoku to your Web page using an iframe.
- J. Halliday, R. Rutter, J. St. John: Sudoku Generation Using Human Logic Methods (PDF)
- Generation of Sudoku boards with Perl program.
- Andrew Stuart: Sudoku Solver
- The working of the solution techniques is shown step by step. Very nice.
- S. Chadwick, R. Krieg, Ch. Granade: Ease and Toil: Analyzing Sudoku (PDF)
- Construction of Sudoku puzzles with a Python program.
- Nicoli: Sudoku
- Simple explanation of Sudoku.
- Sudoku of the Day
- Solution techniques
- Sterten: Sudoku
- Difficult Sudokus in textual form for program testing.
- Sudoku.com
- Play Sudoku.
- Peter J. Cameron: Sudoku, Mathematics and Statistics (PDF)
- History and mathematics of Sudoku in short.
- The Sudoku Learning Center by Patrick J. O'Neil
- Learning Sudoku.
- Josh Metzler: Sudoku
- A nice player.
- Bob Hanson: Sudoku Assistent/Solver
- Yet another nice site.
- Emanuele Feronato: Sudoku creator/solver with PHP
- A simple solver in PHP using backtracking.
- Vegard Hanssen: Sudoku puzzles
- A database of solved puzzles (about 7 millions on February 2010).
- internetSudoku
- On internetsudoku.net you can play sudoku using your computer, tablet, or smartphone.