Knock-knock

Knock-knock is about a Lodger trying to stay awake and sane until dawn in an unusual cabin deep in the woods. The cabin has served as both laboratory and home to three generations of Lodgers. Now, the latest Lodger notices familiar things changing or disappearing, hears noises and rattling, and senses something coming from the woods and settling into the rooms, attic and cellar at night.

The nights

You guide the Lodger through the rooms, evading the unknown and watching the minutes pass until morning. Each night, you must reach dawn while remaining sane, and the Lodger can solve the main puzzle only at night. You hide from the denizens of his nightmares, and must watch and listen carefully, inspect your surroundings and learn the rules of the game being played.

The mystery

The Lodger has lost something important, and the reason behind the events lies somewhere inside the cabin. The house aids him; you need to fix it up and keep it in order. Search for the key that brings the explanation to light, and uncover what happened to the forest and the cabin—and whether the Guests are real or products of the Lodger's insomniac imagination.