From the publisher website: Let's be honest. If you're looking at this book, it's because you like tabletop gaming on some level. You're looking for a good one, a new experience, or something to replace your old system you have complaints about. So, let me sum it up for you, and give you some cold hard facts.... The game has two "modes", the basic game for casual story-line play, and an extended full game that extends the basic to be a robust and complex system (that is designed to be easily further extended.)