Sudoku World

Sudoku is a logic-based number-placement puzzle. The objective is to fill a 9x9 grid so that each column, each row, and each of the nine 3x3 boxes (also called blocks or regions) contains the digits from 1 to 9 only one time each. The solver only solves sudokus with a unique solution.

Valid Input Forms

 
     - - - - - 3 8 - -      .4.6.....       706005004
     - - 6 7 - - - - -      9..4..6.1       000000620
     - 2 - - 5 - - - 1      6...8..9.       000609007
     - 6 - - 8 - - - 4      ....4.3..       005230060
     - - 3 9 - 2 6 - -      59.....47       070000040
     1 - - - 7 - - 9 -      ..3.1....       020064800
     9 - - - 1 - - 5 -      .2..7...9       400103000
     - - - - - 6 3 - -      3.4..9..5       069000000
     - - 7 2 - - - - -      .....1.8.       100400905

Sudoku to solve: