Tic Tac Toe
Tic Tac Toe is a great game when all you have is a pen, paper, and a little sister who is easily distracted. After a certain age, however, got begin to realize that they will all eventually end in a draw. What I remember most about this game is that it saved the world in War Games.

No Thermonuclear Warfare today. Thank you, Matthew Broderick, for your next quick thinking. Dr, Faulkner, I think that Joshua might need a time out. In the end, I would say that it was Tic Tac Toe that was the real hero. This repetitive and simple game stopped a war. What other games can say that?