Decay is an asymmetrical horror game where 1–2 killers face off against 10 survivors in each round. The game is designed around tension, teamwork, and absolute horror. The core genres of Decay are survival horror and asymmetrical multiplayer, combining objective-based gameplay with team collaboration. The game features a variety of systems including different game modes, map-dependent tasks, AI-controlled and player-controlled killers, and light gore and blood effects to enhance atmosphere and intensity.