Horizon Zero Dawn is an action role-playing game developed by Guerrilla Games and published by Sony Interactive Entertainment. It was released for the PlayStation 4 in early 2017. 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 mechanised creatures and loot their remains. A skill tree provides the player with new abilities and bonuses. The player can explore the open world to discover side quests.
Horizon Zero Dawn is Guerrilla Games' first intellectual property since Killzone in 2004 and also its first role-playing game. Development began in 2011 after the completion of Killzone 3, with director Mathijs de Jonge considering it the riskiest idea pitched at the time. The game engine, Decima, was developed for Killzone Shadow Fall and altered for Horizon Zero Dawn. Anthropologists were consulted to authenticate the world's decay over a millennium. The soundtrack, led by composer Joris de Man, contains experimental instrumentation.
Horizon Zero Dawn won numerous awards, and 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. By February 2019, the game had sold over 10 million copies, making it the best-selling PlayStation 4 game. An expansion, The Frozen Wilds, was released in November 2017.