In a small town, the renowned assassin Jeff has appeared. Together with his accomplices, he steals children, and then performs dark rituals in the old estate during which the children are killed. You in the game Jeff The Killer: Lost in the Nightmare will have to enter this house and destroy all criminals. In front of you on the screen you will see dark corridors and rooms of the estate along which your character will move. You will need to carefully examine everything. Try to collect items scattered all over the place. You can also find hidden caches in which weapons and first-aid kits will be located. When you meet someone their opponents attack him. Using the found weapons, you will destroy them and get points for it.