Legendary Sudoku description

One of the most popular puzzle games in the world.
Sudoku, is a logic-based, combinatorial number-placement puzzle. The objective is to fill a 9×9 grid with digits so that each column, each row, and each of the nine 3×3 subgrids that compose the grid (also called "boxes", "blocks", "regions", or "subsquares") contains all of the digits from 1 to 9. The puzzle setter provides a partially completed grid, which for a well-posed puzzle has a unique solution.

Features:
- A huge number of puzzles.
- Save your sudoku.
- Intuitive interface.
- Multiple difficulty levels.

The new version is already in development.