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. 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.