You are the King of Babylon in ancient times. Instead of conquering tribes, expanding your military, or courting beautiful women, you get to listen to disputes between the common people. Hurray!
You are presented with a quarrel between two citizens. There is the accuser's story (or plaintiff if we want to use legal jargon) and the defense's story. Listen to both sides. Ask for witnesses, ask for evidence, ask for a foot rub (after all, you are the king). Ultimately, you need to make a ruling for who you favor. The Code of Hummurabi is the law of the land and is available for you to review at anytime (don't worry, it's only like 12 laws). Your ruling can follow the code, which would make your reputation seen as a fair and justice ruler. But if you stray from the code, or just act like a moron not taking his job as king seriously, your reputation will fall.
You get three trials to preside over. At the end of the 3rd trial the game ends and your score is presented. Your score is on a scale of 0-100 based on your reputation. The higher your reputation, the higher the score. A note to the perfectionists: a 100 score does not mean you "win the game." It just means you were the most just and professional you can be. "Winning" is subjective to the player. If you want to clown around and shoot for a score of zero, be my guest.