Sudoku classic is a logic-based, combinatorial number-placement puzzle game. You need 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 to win the game. FEATURES: - Different difficulties ( Easy - Medium - Hard - Expert ) - Hundreds of puzzles for each difficulty - Puzzle Mode With more than 1000 levels. - Daily Challenge Mode. - Pencil - Undo - Hint - Erase - Timer (optional) - Clean int