Up to four items can be kept in an inventory space. The game is played in a first-person perspective, and the player must aim a reticle at certain objects to interact with them or to throw or use a currently held item (for example, throwing a ball at a window or aiming a crowbar at nails to remove them). The game is divided into four parts: Act 1, Act 2, Act 3, and Act Finale. However, he is still to be avoided at all costs. However, the player can use the game settings to turn on 'friendly' neighbor mode, preventing the neighbor from setting these traps and causing him to be less aggressive in his pursuits. Upon starting again, the player must be more careful, as the neighbor will deduce movements from the last attempt to set up traps. If the player is caught (or suffers a serious injury), they will be sent back to their own house and will have to break in again. The player can stun the neighbor by throwing objects at him for an easier escape. As the player explores the neighbor's house, they must not be spotted by the mysterious neighbor, or they will be chased down, and if the player is not quick enough to hide or escape, then they will be captured. The player's task is to break into the neighbor's home and solve a series of puzzles to gather the items needed to unlock and access his basement. In Hello Neighbor, the player finds themselves moving into a new house across the street from a mysterious neighbor who is behaving in a paranoid manner and seems to be keeping a secret in his basement. A standalone sequel, Hello Neighbor 2, was released on December 6, 2022.

Two multiplayer spin-offs, Secret Neighbor and Hello Engineer, were released in October 2019 and October 2021, respectively.

The game spawned a franchise, beginning with a prequel, Hello Neighbor: Hide and Seek, released in December 2018. Critics panned the gameplay, control scheme, and technical performance, although some praised the story, mystery elements, and art style. While the initial alpha versions of Hello Neighbor were received positively, the final product was met with largely negative reviews. The game's artificial intelligence (AI) modifies the neighbor's behavior based on the player's past actions, such as setting traps along paths the player followed in a previous attempt. Their goal is to successfully sneak into the basement of the neighbor's house to uncover a dark secret while avoiding being caught by him. In the game, players play as a citizen, who just moved into the neighborhood, and try to break into their neighbor's house. Initially released as public alphas from 2016 to 2017, it received a full release for Windows and Xbox One on December 8, 2017, and later for PlayStation 4, Nintendo Switch, iOS and Android on July 26, 2018. Hello Neighbor is a survival horror stealth game developed by Russian studio Dynamic Pixels and published by tinyBuild.

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