Decline is a horror game set in an abandoned underground drainage facility, where players take on the role of a night shift worker. What begins as a routine job quickly spirals into chaos as players encounter unsettling entities and unravel a terrifying narrative. The game challenges players to manage resources, stay alert, and adapt to a constantly evolving environment, where each shift alters the rules of survival.

The experience extends beyond the gameplay, as players delve into fragmented memories and liminal spaces between night shifts. Decline offers hidden secrets, easter eggs, and multiple endings, rewarding exploration and attention to detail. With its unpredictable nature and immersive storytelling, Decline provides a unique horror experience that keeps players engaged and on edge, urging them to uncover the truth while battling their own fears.