Sudoku is a pattern-matching puzzle with one rule: place the numbers 1 through 9 such that there is only one of each in every row, column and 3x3 box. There are many strategies and rules of logic that come out of this very simple rule and are what make Sudoku such a compelling experience. For more information, go here.
What is the Zen of Sudoku?
The Zen of Sudoku removes the tedium and difficulty of Sudoku and focuses on the relaxing, satisfying aspects of it. It is designed to be the most pleasant way to play for both beginners and experienced Sudoku masters.