World Puzzle Federation

The World Puzzle Federation is an international organization dedicated to puzzles. It follows the Olympic standard, and brings together puzzlers from around the world for the annual World Puzzle Championship. The 15th World Puzzle Championship will take place October 7 - 12 (2006) in Borovets, Bulgaria

http://www.worldpuzzle.org/

Sodoku Puzzles

The Sodoku puzzle is a logic game using numbers 1-9. It came to western world an year ago (2005). Read the history of this game in wikipedia.org.

The Rule

Every Column, Row and 3x3 box contains digits 1-9. No duplicates and no missing numbers.

Tips

Use logic and reasoning instead of guessing a number. Here is a step by step tutorial from soduko.org

Some tough ones to crack.

Puzzle 1and 2

The Know the Game

1. The Times Online - History http://www.timesonline.co.uk/article/0,,2-2208881.html

2. Mathematics behind the game - http://www.phil.uu.nl/~oostrom/cki20/02-03/japansepuzzles/ASP.pdf

3. BBC News - Puzzling Popularity of Sodoku - http://news.bbc.co.uk/2/hi/uk_news/magazine/4469719.stm

4. The Guardian - So you thought Sodoku came from the land of rising sun ... http://observer.guardian.co.uk/uk_news/story/0,6903,1484328,00.html

5. Sourceforge.Net - Open Source Sodoku Java Game http://playsudoku.sourceforge.net/

Links to Sodoku Sites

1. http://www.soduko.org/

2. http://www.daily-sudoku.com/soduko.php

3. http://www.soduko-soduko.org/index.php

4. http://www.codestore.net/store.nsf/unid/BLOG-20050608

5. http://www.sudoku.com/

6. http://onigame.livejournal.com/20626.html

7. Windows Sodoku Games - http://www.sadmansoftware.com/sudoku/index.html

8. 2DPlay.Com - Sodoku Online Game - http://www.2dplay.com/sudoku-original/sudoku-original-play.htm