A free program for Android, by manbenapp.

Sudoku is a logic-based, combinatorial number-placement puzzle. The objective is to fill a 9×9 grid with digits so that each column, each row, and each of the nine 3×3 sub-grids that compose the grid (also called boxes, blocks, regions, or sub-squares) contain all of the digits from 1 to 9.

Sudoku for adults is a game of strategic thinking that will help improve your brain’s ability to analyze, plan, and execute. The game consists of a grid that is provided with some of the cells already completed. The rest of the cells are blank and it is the player’s job to fill them in.

The game consists of many levels that are divided into three sections: Easy, Medium, and Hard. Each level contains five to ten puzzles and it is the player’s job to clear each level by solving the puzzles.