I think I'm probably the only one on the site who plays this game, but i thought i would give it a mention as i feel it's a very good game.
Basically you have two modes within one mode; Office Mode and Ruler Mode. The main mode is Empire Mode.
In Ruler mode you can create a character or choose an existing one. You begin without an area, but you can take over an area in battle.
In Officer mode, you again choose a character, but this time you can move around the map and server under a liege. After a while you overthrow him/her and become the ruler which will take you to ruler mode.
The game is based in feudal China in the early 100s.
If there's anything else you want to know, just ask.