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Comfortable Sudoku


Sudoku is a logic-based,number-placement puzzle. The objective is to fill empty grid with digits so that each column, each row, and each of the nine 3×3 block that compose the grid contains all of the digits from 1 to 9. Comfortable Sudoku features: ★Press and hold a grid, you can enter a number directly. ☆10 different levels of difficulty ☆Three input modes ☆Undo / Redo ☆Hint mode