The structure of the game is an agent-based artificial life program. The presentation of the game's artificial intelligence is advanced, and the Sims will respond to outside conditions independently, though often the player's intervention is necessary to keep the Sims on the right track. The Sims technically has unlimited replay value, in that there is no way to truly win the game, and the player can play indefinitely. It has been described as more like a toy than a game.[3]
Sims are influenced by the player to interact with objects or other Sims. Sims may receive guests at their home lot, invited or not, from other playable lots or from unhoused non-player character (NPC) Sims. If enabled in the game's options, Sims have a certain amount of free will, allowing them to autonomously interact with their world. However, the player can override most of these autonomous actions by cancelling them in the action queue at the top of the screen. Unlike the simulated environments in games such as SimCity, SimEarth or SimLife, Sims are not fully autonomous.[4] They are unable to take certain actions without specific commands, such as paying bills, finding a job, exercising, and conceiving children. Sims communicate in a fictional language called Simlish, which is mostly composed of blowing raspberries and saying nonsense.[5]
A lazy and sloppy Sim
The player can make decisions about time spent in skill development, such as exercise, reading, creativity, and logic by adding activities to Sims' daily agenda. Daily needs such as hygiene and eating can and must also be scheduled. Although Sims can autonomously perform these actions, they may not prioritize them effectively and can suffer consequences for neglecting their own needs. In addition, Sims must maintain balanced budgets and usually supplement an income by obtaining a job. Sims may earn promotions by fulfilling skills and maintaining friendships with others for each level, which lead to new job titles, increased wages, and different work hours. Alternately, Sims may create and sell various artwork and items at home.[3]
The original neighborhood in The Sims consists of a single screen displaying all playable houses.
While there is no eventual objective to the game, states of failure do exist in The Sims. One is that Sims may die, either by starvation, drowning, fire, or electrocution (or from natural causes/age in certain versions). When a Sim dies, a tombstone or an urn will appear (in later expansion packs, the Grim Reaper will appear first),[4] and the ghost of the deceased Sim may haunt the building where it died. In addition, Sims can leave the game for good and never return, or two adult Sims with a bad relationship may brawl, eventually resulting in one of them moving out. Children will be sent away to military school if they fail their classes or if they have not fulfilled their needs (especially when hunger is very low), a social care worker will take them away from their household and they are no longer returnable.[5]
