Knock-knock is an indie survival horror game that costs $9.99.
The gameplay consists of a surreal 2D environment where the player is tasked with searching their house in order to search for creatures. The player wants to avoid these creatures and can do so by using lighting to create obstacles out of furniture that will appear using light or by escaping a room altogether. The goal is to survive every night by staying "sane".
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Pro Playing gives a feeling of an "experience"
As the game progresses the player ascends deeper and deeper into the characters madness that more and more is the users fault, or so the game makes one feel that way. There is a sense of dread as one explores as well and when combining these feelings one can't help but feel not only responsible for what is happening but also be frightened of it.
Pro Fresh experience every time played
Each level is randomly generated, so each play session is fresh to the player making for a new experience each time played as to not become repetitive.
Con No guidelines or help
While it is by design there is no real purpose outlined in the game nor is there any tutorial that explains anything, it is up to the player to figure out how the game works. This can be frustrating for some players.