Horizon Zero Dawn is a 2017 action role-playing game developed by Guerrilla Games and published by Sony Interactive Entertainment. The plot follows Aloy, a hunter in a world overrun by machines, who sets out to uncover her past. The player uses ranged weapons, a spear, and stealth to combat mechanical creatures and other enemy forces. A skill tree provides the player with new abilities and bonuses. The player can explore the open world to discover locations and take on side quests. It was released for the PlayStation 4 in 2017 and Microsoft Windows in 2020. Horizon Zero Dawn was praised by critics for its open world, story, visuals, combat, characterisation, and the performance of voice actress Ashly Burch; however, the dialogue, melee combat, and character models received some criticism. The game won numerous awards and sold over 10 million copies by February 2019, making it one of the best-selling PlayStation 4 games. An expansion, The Frozen Wilds, was released in November 2017. A sequel, Horizon Forbidden West, is currently scheduled to be released for the PlayStation 4 and PlayStation 5 in 2021.