asking me "Do I want to play a game?": What should I do?

Choose Global Thermonuclear War and take the Russian side. But remember "the only winning move is not to play."

I think if you play that game you could start a world war. Seems i recall that from some 80's movie or something.But if you do play the game it could be a happy ending and you get the girl?

You hacked a computer? how to do it?

Play tic tac toe in the computer to computer mode and save the world