Ultimate Tic Tac Toe Game

So, we present all the familiar game of "tic-tac-toe. Only in this game there is some difference, the field is no longer 3x3 cells, and much more and need to put 4 zeros or crosses in a row. You can play both with parents, friends and with the computer, which is almost never loses. If you choose the mode with the computer, you will have a choice of three modes of complexity. If you want to win then choose a simple level, then you can easily become a winner. Medium level is much harder, to win at it can only be a serious player with experience. Well, the difficult level, only for the most intelligent and attentive, after all beat the computer is very simple.