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Sudoku (originally called Number Place) is a logic-based, combinatorial number-placement puzzle. The objective is to fill a 9x9 grid with digits so that each column, each row, and each of the nine 3x3 sub-grids that compose the grid contains all of the digits from 1 to 9. FEATURES:- different difficulties- hundreds of puzzles for each difficulty- auto pencil mark (draft)- hint system- auto-save your progress for each puzzle- unlimited undo/redo- selected cell highlight- number highlight (optional)- errors highlight (optional)- clean interface and smooth controls- phones and tablets support