Fun has it, pull both peoples, the nomads have only one stage for which they can ascend and the farmers of course, the Highest again the nobles.
At the end of each maximum level of civilization can build a monument, which I knew not, substitute for any other community buildings.
So you just placed an Imperial or Sultan Mosque and around the building can cheerful as you are only building residents and these are all perfectly happy. Super!
Multiplayer is fun, have already played me several friends and co-op should probably be really exciting. (Two to four players can participate in a "character" build and work, so can a care for the nomads of the trade routes, one to the productions and keeps the people in the eye.)
All in all it's a very successful game and has a bunch of Archievments. I would buy it again for me.