Tic-Tac-Toe, or noughts and crosses, or whatever the hell you call it, is an ages old game of skill and chance.
The skill required is having a functioning brain. The chance aspect is that you can only hope your opponent lacks a functioning brain. If you both have IQs over 80, you are doomed to ties until one of you gnaws your hand off.
Apparently the Romans did it right, and only gave each player 3 markers to move around the board, allowing games to take more than 5 seconds.
Do you prefer Xs or Os?