In "Metro 2033" (2010), a nuclear war occurs in late 2013. Russia was targeted with atomic bombs, causing severe radiation across Moscow, forcing the rest of the people to live underground in the metro stations away from the deadly effects of radiation. Many animals and humans left behind mutated into creatures known as the Dark Ones, who were left outside for the next 20 years. The game is played from the perspective of Artyom, a 20-year-old male survivor and one of the many children brought into the metro right before the bombs dropped. The story takes place in post-apocalyptic Moscow, mostly inside the metro system, but some missions have the player go to the surface which is severely irradiated and a gas mask must be worn at all times due to the toxic air. A sequel, "" was released in 2013. A sequel to "Metro: Last Light"; "Metro: Exodus" was produced in 2019.