Metro 2033 is a first-person shooter video game with survival horror elements, based on the novel Metro 2033 by Russian author Dmitry Glukhovsky. The game is played from the perspective of Artyom, the player-character. The story takes place in post-apocalyptic Moscow, mostly inside the metro system, but occasionally missions bring the player above-ground. As a first-person shooter, Metro 2033 features a variety of firearms, some fictional and some based on real weapons, which the player will use in combat. Combat alternates between the player fighting mutants and the player fighting hostile humans. Mutants do not possess weapons and tend to physically attack the player in swarms, while humans fight with the same firearms available to the player. The game features recharging health rather than a traditional health pointssystem—if the player avoids taking damage for a period, health will slowly recharge, however, the player can speed up this process by using a stim from a medkit, which will almost instantly heal them to full health. When the player is severely injured, it may take over twenty seconds to return to full health.