The entire Sims franchise is designed to create experiences that simulate life. From The Sims to The Sims 4, changes and additions have been made to create an immersive and realistic gameplay experience - even with the addition of magic and Star Wars lore. Outside the traditional "traits" system that players can use to determine their Sim's personality, The Sims 4 introduced the "emotions" mechanic that changes a Sim's emotional state. With the development of The Sims 5 - aka "Project Rene" - The Sims' gameplay could be made more realistic by adding mental health mechanics.