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The Sims 4
The fourth mainline Sims game, built around a dominant emotion computed from moodlets, three-trait personalities with aspiration rewards, multitasking, room-based building, and an in-game Gallery for sharing creations.
parts
20 mechanics, as The Sims 4 does themcore · 3
Memories and thoughts
Moodlets carry an emotion type (such as Happy, Focused, Flirty, Angry, Tense, or Sad), an intensity, and a timer; the highest-weighted emotion becomes the Sim's dominant emotion.
Needs decay
Six needs (Hunger, Bladder, Energy, Social, Hygiene, Fun) decay and spawn negative moodlets such as Hungry or Bored when low.
Personality traits
Adults hold three traits and children and teens two, plus one bonus trait from the aspiration; traits add moodlets, autonomous behaviors, and exclusive interactions.
supporting · 17
Agent skills
Aspirations and wants
The chosen aspiration grants a bonus trait and a track of milestones whose completion earns reward traits; short-term whims, later reworked as wants and fears, appear from emotions and traits.
Autonomy levels
Free will can be toggled; with it off Sims act only on player orders except for urgent needs.
Blueprints
Sims, households, rooms, and lots can be saved to a personal library and placed again.
Building placement
Build mode draws walls and rooms, places premade rooms, and moves or duplicates whole rooms.
Career ladder
Careers require related skills, for example Cooking and Mixology for Culinary.
Content sharing
The Gallery uploads and downloads Sims, households, rooms, and buildings from other players inside the game.
Lifecycle and aging
Newborn, infant, toddler, child, teen, young adult, adult, and elder; toddlers were added in 2017 and newborn and infant in 2023.
Modding API
Python script mods and package files load from the Mods folder.
Mood and breakdowns
Dominant emotions unlock emotion-specific interactions and raise gain for matching skills (Inspired for creative, Focused for mental, Energized for physical); extreme states such as Hysterical can kill.
Off-screen life progression
Neighborhood Stories, added in a free update, advances unplayed households with events such as moves, relationships, and births, with settings that limit which households and event types it may touch.
Pause and speed control
Relationship values
Separate friendship and romance bars per pair.
Romance and family
Smart objects
Objects advertise need, skill, and emotion gains, and Sims multitask, such as talking while cooking.
Social exchanges
Social menus are filtered by emotion and traits, with emotion-specific variants of interactions.
Utility action selection
core loop
build a home or download one from the Gallery -> moodlets from events and surroundings set the dominant emotion -> emotion unlocks interactions and speeds skills -> pursue aspiration milestones and a career -> earn rewards -> share households and builds
design notes
The Sims 4 makes emotion the central state: moodlets from actions, events, objects, and social interactions carry an emotion type and weight, and the strongest set the Sim's single dominant emotion, which gates emotional interactions and speeds matching skills. Adult personality is three traits plus a bonus trait from the chosen aspiration, and completing aspiration milestones grants reward traits. Build mode treats rooms as units that can be moved, duplicated, saved to a library, and shared through the Gallery; the base game became free to play on 2022-10-18. Neighborhood Stories, a free update that advances unplayed households, is the offscreen-life-progression mechanic.