The Napoleon of Notting Hill, coming soon to a college near you. This is a game designed by some college students, which allows you and all your residential college to fight for Campus domination. A map of your campus is divided into zones, you have a certain amount of time to recruit fellow students (because the number of your armies depends on the number of real people playing) and everybody takes about two minutes a day to move their armies in accordance with a strategy determined by the team as a whole or by elected generals. The best thing about it is the philosophy of the creators: http://gocrosscampus.com/faqs/#caqs
Sadly, I will no longer be here when it is available to non-rescollege students of Wash-U!