Jon of RealGamerNewz writes, "Something is going on in this game that taps into the other side, and not that pretty / flowery other side that good folks are sent to when they pass. I’m talking about the other side that reaches its hand into the realm of the living and touches us only when we are at our highest anxiety levels, inspiring some of our worst fears and least sane decisions. In Knock-Knock, players take the shoes of a restless man who deals with a presence in his home that can only be described as demonic.
You will find yourself blaming your own thoughts as if you are the one who has invited this presence to terrorize you. There are only a few things you can do to try and maintain sanity. Short of lighting up the house and turning your back to the horrific waking nightmare that is occurring, the player is subject to an experience that is possibly more terrifying than the recent releases in this genre. This is because at the same time you are playing the game, it’s really happening to you. That presence is reaching into your life and touching your soul with it’s cold fingers, whether you believe in its existence or not."