The only aim in Rust is to survive.
To do this you will need to overcome struggles such as hunger, thirst and cold. Build a fire. Build a shelter. Kill animals for meat. Protect yourself from other players, and kill them for meat. Create alliances with other players and form a town.
The developers describe the content like this:
This Game may contain content not appropriate for all ages, or may not be appropriate for viewing at work: Nudity or Sexual Content, Frequent Violence or Gore, General Mature Content.
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