Like king james said, players will play for wonders or improved wonders. For example, if they get in top 100 or certain nation strengh u have to have, they could have a Internet wonder from pop happ 5% to 10%. When they get in top 10 it could be a better wonder improvement like SDC could change the 10% to 15% and if they finish number 1 they could have extra 5 nukes on their MP