_Sudoku_

Sudoku is a logic-based, combinatorial number-placement puzzle game. The objective is to fill a 9x9 grid with digits 1to 9 so that each column, each row, and each of the nine 3x3 sub-grids contains each digit once. This App provides 50.000 levels in 5 difficulties (very easy, easy, medium, hard, very hard). You can find the solution on your own, using a „pencil“ or other support (automatic hints, unhide a digit). An “undo”-button allows you to go back several steps. A timer is providing an addit...