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RESIDUUM is a first-person psychological horror experience set within a decaying underground research facility. You awaken alone in this forsaken complex with fragmented memories and no clear path to escape. Armed with only an unreliable flashlight and a faulty heartbeat sensor, you must navigate the darkness while managing limited power and uncovering the truth behind your imprisonment. The facility itself becomes a character—semi-open and labyrinthine, filled with environmental storytelling through scattered recordings, photographs, and notes that piece together a disturbing narrative of unethical experimentation.

Gameplay centers on resource management and atmospheric tension. Your flashlight requires constant maintenance to stay functional, creating a persistent survival pressure. The heartbeat sensor provides unreliable warnings of danger, forcing you to rely on sound design and environmental cues. Power management extends beyond your flashlight to facility systems, adding strategic depth to exploration. Every decision about where to venture and what to prioritize carries weight.

What distinguishes RESIDUUM is its commitment to dread through restraint. Rather than relying on jump scares, the game builds tension through immersive sound design, environmental decay, and the constant presence of an adaptive threat that learns your movements and attempts to cut off escape routes. The PSX-inspired aesthetic enhances the unsettling atmosphere, while the semi-open facility design rewards careful exploration and pattern recognition.

The game appeals to players seeking genuine psychological horror over action-oriented scares. It demands patience, attention to environmental details, and comfort with uncertainty. Fans of atmospheric survival horror, games like Amnesia, and titles that prioritize mood over spectacle will find RESIDUUM's claustrophobic descent compelling. This is horror designed to linger in memory rather than provide cathartic thrills.