Starless Abyss is a first-person horror-puzzle adventure set deep within a derelict underground research facility. You awaken alone in dimly lit corridors where color-coded light sources-red, green and blue-are the only way to unlock doors, activate ancient machines and reveal hidden passageways. As you navigate shifting layouts and solve environment-based challenges, reality itself seems to warp: walls breathe, shadows slither and memories flicker at the edge of your vision. Randomized light panels keep each playthrough unpredictable, while scattered documents and cryptic recordings piece together the facility’s dark past. Stay alert for the grotesque inhabitants that prowl the darkness, learn to manipulate your surroundings to evade them, and follow branching clues toward one of many possible endings. In this pixel-inspired world, every choice could be your last.