Connect 4 (Four in a row)

The classic Connect 4 game. The rules are simple - the first who has four of his markers in a row wins. However, the opponent can be quite hard to master!

Chose level of difficulty and size of board, from 5x5 to 8x8.

4 in row, 4 in a row, 4 in line, 4 in a line, Four in a row, Four in a row