"Ultimate Custom Night" is a survival horror game developed by Scott Cawthon. In this game, players are placed in a security office and must survive against various animatronic characters from previous Five Nights at Freddy's games. The game offers a high level of customization, allowing players to choose which animatronics they want to face and adjust their difficulty level.

The game features 50 selectable animatronic characters, each with their own unique abilities and movements. Players must use various tools and resources available to them in the office, such as a security camera system, to keep track of the animatronics' movements and prevent them from reaching the player's location.

The game's survival mechanics include managing power consumption, closing doors, and using vents to prevent the animatronics from entering the office. Players must also react quickly to auditory and visual cues, as some animatronics can disable cameras and other equipment.

"Ultimate Custom Night" provides a challenging and intense experience for fans of the Five Nights at Freddy's series. It offers a wide range of customization options and difficulty levels, ensuring players can tailor the experience to their skill level.