- One Halloween Night is a realistic home-invasion horror experience created using the Unity Engine. This is definitely my best project yet, and I appreciate every download! -You take the position of a teenage boy, who is left home alone on Halloween night. Your parents had to unexpectedly leave the house for the night, with you left to manage trick-or-treaters. What should have been a simple, smooth, and relaxing night, quickly turns into a terrifying Nightmare. - Full gameplay takes about 25 minutes.