Nightmare House 2 Prologue Walkthrough – Part 1 – CRANK THE VOLUME – Scary Gameplay , Hello Everyone my name is Purpleoak and I bring to you Nightmare House 2. Now this is a Half Life 2 Mod that is really scary. It brings a whole new word to the meaning of horror gaming. This is Part 1 or Chapter 1 which ever you may prefer to call it. Now this is the Prologue for Nightmare House 2 and it.