The game was originally developed for the iPad and released in December 2013; it was made universal to work with the iPhone in January 2014.

The game uses the mobile device's touch screen controls to simulate actions like turning a key or opening a drawer, as well as to zoom in and out of the various puzzles.

The player has a lens that shows special messages and areas made from "Null", a strange material central to the game's plot.

The game's story continues from the previous title, in which the player is trapped in a mysterious Null-based dimension, and is following in the footsteps of an acquaintance (known only as "A.S.") who has discovered these boxes based on the Null element, which imbues them with supernatural properties.

The letters from the friend tell the player-character to move through each room quickly, warning of the risk of insanity to those who are exposed to it too long.

The player, on completing the final room, finds the exit leading back to the house where the first game started, but chased by tendrils of an evil entity using the Null.