Sudoku is a logic puzzle and the goal is to fill in the numbers from 1 to 9 in a 9 × 9 grid so that each number in each column, row and block occurs only once. Game Features: 3 levels of difficulty. Hints. Representation of the sectional fields. Edit your own puzzles. Quick solution calculation. Undo and Redo function. Automatic saving of the last game. Timer.