Sudoku Puzzle Classic!

Puzzles SUDOKU easy level, medium and hardVery easy, with the following functions:- Undo: Delete last number entered- Validate: Checks if the numbers entered are correct- Hint: Enter a number, useful if we stay locked- Solve: Solve the puzzle automatically- Reset: Returns to the beginning, erasing all entered numbers- Pencil: You can write draft numbers- Eraser: Clean the number of the active cell