Sudoku (Japanese: 数独 listen(help·info)?);English pronunciation: /suːˈdoʊkuː/ soo-DOH-koo) isalogic-based,[1][2] combinatorial[3] number-placement puzzle.Theobjective is to fill a 9×9 grid with digits so that eachcolumn,each row, and each of the nine 3×3 sub-grids that composethe grid(also called "boxes", "blocks", "regions", or"sub-squares")contains all of the digits from 1 to 9. The puzzlesetter providesa partially completed grid, which typically has aunique solution.

Based on anoku

source code here

https://github.com/spicysquid/andoku