Until Dawn on PS4 is an interactive horror drama developed by Supermassive Games and published by Sony Computer Entertainment, released on August 25, 2015. This psychological horror game puts you in control of a group of eight teenagers who spend a week in a remote mountain lodge, only to discover that someone or something is out to kill them. The game features the Butterfly Effect system where every choice you make affects the story and character survival, with memories, relationships, and deaths all influencing what happens next. The Death Rewind system lets you rewind time to prevent irreversible deaths. This version includes the pre-order bonus chapter 'Matt and Emily' (also called 'Emily's Bag'), a lost chapter that shows Matt and Emily going to find Emily's bags on a cold, snowy mountain path where they realize they are not alone. This bonus scene plays automatically at the end of Chapter 2 after turning on the boiler and before the psychiatrist's office scene, providing extra backstory and tension.