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 PlayStation 3. It was officially revealed on December 10, 2011, during the Spike TV Video Game Awards and released worldwide on June 14, 2013. It was released in Japan on June 20, 2013. The player takes control of Joel (voiced and motion captured by Troy Baker), who is trekking across a post-apocalyptic United States in 2033, in order to escort the young Ellie (voiced and motion captured by Ashley Johnson) 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. The Last of Us received critical acclaim for its writing, voice acting, sound design, level design, and art direction. The game's narrative was praised for its characterization, application of subtext, and critical depiction of the human condition, dealing with themes of sacrifice, loyalty, fate, and hope. Positive reception helped establish The Last of Us as a significant title of the seventh generation video game era. The Last of Us was the second largest video game launch of 2013 (after Grand Theft Auto V), selling over 1.3 million units in its first week. As of July 2013, the game has sold 3.4 million units, making it the fastest-selling PlayStation 3 game after three weeks.