"Four In A Row" Game

This game is designed for puzzle lovers. At first glance it may seem very simple, but it is not so. The essence of the game is to collect in one line 4 balls of the same color, and it does not matter, horizontally or vertically. The main thing that the balls went unbroken line! The game is designed for two players, and it has two modes. The first mode allows you to play against a real opponent, and the second mode allows you to play against your own computer. But keep in mind that the opponent will try to hinder you in every possible way in the implementation of the idea! The game ends in two cases: if the player is able to put four identical balls in a row or when there are no empty cells on the playing field.