Knock-Knock is a survival horror game developed by Ice-Pick Lodge for the Play Station 4 platform. The game has a unique approach to horror, relying on the environment to create fear and suspense. The game's plot is full of unclear moments, which allows for multiple interpretations. The main character, the Resident, lives in a house in the middle of a forest, where he notices weird changes in his environment. The Resident wants to figure out what's going on, and the player must help him survive until dawn.

The gameplay of Knock-Knock is centered around survival. The player must turn on the lights in the rooms of the house to interact with the items placed inside. These items include a clock to speed up time and hiding spots to avoid enemies. The lighting system is an indicator for the appearance of enemies, as it turns off when someone is close to the player. The gameplay is affected by the Resident's poor memory and eyesight, which adds an extra layer of difficulty.

Knock-Knock's unique feature is its relative time system, which can pause, pass as usual, or go back depending on the player's actions. Overall, Knock-Knock is a must-play for horror game fans who want to experience something different.