My student love this simulation. The concepts of each city-state fighting each other and the unique benefits each city-state had really stay with the students for a long time. This can be played in one or two days, depending on your time. Included are all of the cards you need, tracking sheets for each city-state as well as cards for each city and their Great Person.
It takes a little time to setup, but it is a very memorable experience for the students. You may want to laminate the cards after printing them out so you can use them over and over. The only thing I did not include is the money because it had my face on it.