The Sims 3 is built upon the same concept as its predecessors. Players control their own Sims' activities and relationships in a manner similar to real life. The game play is open-ended and does not have a defined goal. Challenges occur randomly based on aspects of each Sim's lifestyle, such as relationships, skills and job. Career opportunities such as working overtime or completing special tasks can yield a pay raise, cash bonus, or relationship boost. (wikipedia.org)