I don't think any adult who can hold a thought for 30 seconds can even lose at that game..Aurora219 said:Tic-tac-toe. Studied it as a maths proof in school, so I know how to win the game on a turn-for-turn basis, or at least win.
Also:
[a href="http://xkcd.com/832/"]XKCD's Graphical representation of the game[/a] (the picture is HUGE)