DreamHack Online takes place inside the dreams of ancient creatures called Sleepers — vast beings who sleep in a space-like dimension called the Void, each one representing a different topic, season, or exhibition area. The dreams themselves form a network of visually distinct worlds that can be explored, expanded, and reshaped over time. Players must find a companion in the hub area before the DreamKeeper allows them to enter any dream. Inside the dreams, they can follow the narrative thread — collecting and connecting dream fragments to understand the world's lore through community cooperation — or simply explore freely and discover what is there. All players work together toward a shared objective that changes across seasons, whether that means waking the Sleepers, shaping the dream world, or warding off a corrupting force.