Rules of Sudoku

A basic explanation.

Tips of Playing Sudoku I, Easy

Slicing and dicing.

Tips of Playing Sudoku II, Medium

Combining mini-grids with rows and columns.

Tips of Playing Sudoku III, Medium

The only one that fits

Sudoku is a popular Japanese mind game and a puzzle that you solve with reasoning and logic. Fill in the grid with digits in such a manner that every row, every column and every 3x3 box accommodates the digits 1-9, without repeating any.