The "Skyhill" is a luxury hotel, in which you, as the game’s protagonist, have recently rented a penthouse in. But suddenly, something happens, something evil, something inexplicable -- and the building fills with monsters and mutants. The only way out is the main doors in the ground floor, a hundred stories below. You need to fight your way through the hotel – defeating unknown horrors while collecting gear and materials to help craft better weapons. All while fighting one of your most powerful foes – the need for food and water. Maybe you can just hide out in the hotel, waiting for help to arrive – but what if nobody comes? What if this is the “end of days”, and you’re truly alone?