A little difficult to pickup at first, this game is FANTASTIC! You live your life as... well anything really. You can choose from a handful of goals - such as amassing a fortune or becoming a master in your profession.
I played as a Landlord and I amassed a heft amount of money, a wife and 2 kids. My business soars in the night time when everyone is off work and needing alcohol.
My advice to you is to get this game, now.
Also - a few minutes playing the Tutorial would be well spent.