LadyBirdSudoku

LadyBirdSudoku (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 - hint system - auto-save your progress for each puzzle - unlimited undo/redo - selected cell highlight - number highlight (optional) - clean interface and smooth controls - phones and tablets support