The Last of Us is an action-adventure survival horror video game developed by Naughty Dog and published by Sony Computer Entertainment exclusively for the PS3. The player takes control of Joel, who is trekking across a post-apocalyptic United States in 2033, in order to escort young Ellie to a resistance group, the Fireflies, who believe Ellie may be the key to curing an infection that has ravaged the world. The player defends the characters against zombie-like creatures infected by a mutated strain of the Cordyceps fungus, as well as hostile humans such as bandits and cannibals, employing the use of firearms and stealth aided by capabilities such as a visual representation of sound in order to listen for locations of enemies. The player can also craft weapons or medical items by combining items scavenged in the world.