The Little Nightmares franchise is a critically acclaimed series of puzzle-platformer horror adventure games known for their eerie, oversized environments, unsettling monster designs, and dark childhood-fear themes. 

The core games in the series include:

Little Nightmares (2017): Follows a hungry young girl named Six as she tries to escape The Maw, a massive underwater vessel filled with grotesque guests and chefs. It also features the Secrets of the Maw DLC expansion, telling a parallel story from the perspective of the Runaway Kid. 

Little Nightmares II (2021): Shifts focus to a new protagonist named Mono, who teams up with an AI-controlled Six to navigate the distorted television-signal-corrupted world of the Pale City and uncover its dark secrets. 

Little Nightmares III: Developed by Supermassive Games, this installment follows two new friends—Low and Alone—as they try to escape the Nowhere via the Spiral. Most notably, it introduced online co-op play alongside a single-player mode with an AI companion.