《Tisis》 is a first-person psychological horror game focused on exploration, environmental storytelling, and a deeply narrative-driven experience. Players uncover disturbing clues and fragmented memories as they descend into a world shaped by madness and cosmic terror, revealing the influence of The King in Yellow. Sanity is a core mechanic: remaining in complete darkness gradually drains the protagonist’s mind, forcing players to carefully navigate between shadow and light as reality slowly unravels around them.