Sudoku / Generations of grids

During the first connection you will choose pseudo name and your password. You will reach then a storing database every sudoku that you will have introduced as well as those introduced by the other users.
Sudoku will be validated before being usable. The levels of difficulty are calculated.
You can choose a sudoku of the level wished to try to solve it.
You can abandon at any time the resolution of a sudoku, save your current game and resume it later.
You can also ask for the solution of any sudoku.
You also have the ability to automatically generate sudoku grids with as parameter the number of filled boxes. Validations specify their difficulty levels and perform other boxes if several solutions are possible.