Sudoku

Sudoku is a logic-based, combinatoric number-placement puzzle. The objective of the game 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 without being repeated the same number in each row and column. FEATURES: - different difficulties levels(Easy, Medium, hard) - hundreds of puzzles for each difficulty - auto pencil mark (draft) - auto-save your progress for each puzzle - unlimited undo/redo - selected cell highlight - number highlight - errors highlight - input highlight - timer