Sudoku

Sudoku is a classic logic-based, combinatorial number-placement puzzle game with thousands of puzzles.
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
- 3 levels - easy, medium and hard .
- Many levels in each grade

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