The classic Sudoku is a number placing puzzle based on a 9x9 grid with several given numbers in various places.
The objective of Sudoku is to enter a digit from 1 to 9 in each cell, in such a way that:
each row contains each digit exactly once
each column contains each digit exactly once
each region (subgrid) contains each digit exactly once
A region is a 3x3 box. There are 9 regions in a traditional Sudoku puzzle.
Common misspellings of Sudoku: suduku,suduko,sudoku,sudoko,soduku,soduko,sodoku,sodoko,sundoku,so doku,so do ku.