Gravely Silent: House of Deadlock is a hidden object game published by Big Fish Games. The game starts with a phone call from the playable character's brother-in-law that informs the player of the sister's disappearance. Thus, your goal is to discover why and how your character's sister has disappeared and retrieve her by accomplishing missions throughout the game.
These missions, once accomplished, give the player trophies and special objects that aid him or her in unlocking the "mystery" behind the sister's disappearance. Most of the levels are set in different scenes of the "crime". You must scour these rooms for target objects that are hiding in plain sight.
To help the user drive the gameplay forward, the game has integrated guides to help novices get a feel for the game while playing as the lead character. For instance, levels where the player must find hidden objects offer the user the option to see hints on where a hard-to-find object is located. While these hints are unlimited, the player must wait for a few minutes before the game is "fully charged" to offer hints. Two versions of the game exist: the standard edition and the collector's edition. The latter contains bonus content that is not in the standard edition, which includes extra levels with more challenging missions.