Cool Online Sudoku

## Description

Welcome to Online Sudoku Games. We offer you to dive into the magic of numbers and enjoy the largest collection of Sudoku.

First of all, let's figure out what Sudoku means. Sudoku is a numerical puzzle with a square field of 9x9 cells inside, that is, 81 cells in total. Sudoku is also called a magic square. The square is divided into 9 small squares, 3x3 cells.

At the beginning of the game, some cells has hints inside, the numbers from 1 to 9. The player's task is to fill the remaining empty cells with numbers from 1 to 9 so that the following three conditions are met:

* Numbers should not be repeated in one column;
* Numbers should not be repeated in one line;
* Numbers should not be repeated in a small square (3x3).

The difficulty of Sudoku depends on the initial number of hints. The more hints, the easier Sudoku is. Easy Sudoku can be solved in a few minutes. To solve a hard Sudoku, it may take more than an hour.

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