You can use two different tactics in this game. The aim of OXO is self-explanatory. Be the first to form an OXO, horizontally or vertically. Both players can use either X’s or O’s.
The alternative is that one player gets all the X’s and the other all the O’s. The aim of the game is then to be the first to form a line with your X’s or O’s, either horizontally or vertically.