An overhaul in Create-a-Sim (CAS) that allows you to specify a Sim's romantic attraction, whether they are exploring, and their interest in "Mess Around".

A return of a classic system from previous games, replacing the "Whims" system. Sims now develop dynamic desires (Wants) and psychological hurdles (Fears) based on their experiences and traits.

This update, which preceded the release of the EP12 High School Years and EP13 Growing Together eras, added several refinements and gameplay features to the base game, such as:

One major feature included in (released in late 2022) is the "Loyalty" trait for Sims.