Quoted from the Prosperity Challenge rules:
Do you ever feel like you’re stuck in a rut in your Sims 2 playing? Do you find yourself giving each of your CAS sims the same aspiration and personality? Well here’s a challenge that will break you out of it!
The design of The Prosperity Challenge is to create a well-run, prosperous neighborhood. The difference comes in with the set-up. From the very beginning, you must stretch your abilities by creating sims from the roll of a die.
The roll of the die determines how many families you will start with, the number of members in each family, the age and sex of each member, aspiration, zodiac sign .... basically just about everything! As I usually start my families out as couples, this challenge has given a whole new dimension to my Simming experience.