Black Plague: Penumbra:

: Use your glowstick as your primary light source; it never runs out and is less likely to alert enemies than the flashlight. Save your flashlight batteries for pitch-black areas where the glowstick isn't enough.

Many puzzles require interacting with the environment in creative ways. Penumbra Black Plague Puzzle Guide - Steam Community Penumbra: Black Plague

: Unlike other items, the gas mask does not expire. Keep it ready for areas filled with toxic gas, which can kill you in seconds. : Use your glowstick as your primary light

: There are no melee weapons. If an enemy spots you, your best option is to run and break their line of sight by hiding in a dark corner. Penumbra Black Plague Puzzle Guide - Steam Community

: Use the game's physics system to your advantage. You can block doors with heavy objects like crates or barrels to buy time while escaping from the Infected. Key Early Puzzles

In Black Plague , you are largely defenseless and must rely on your wits to stay alive.

Penumbra: Black Plague is a psychological survival horror game that shifts away from the combat of its predecessor, Overture , to focus almost entirely on stealth, environmental physics, and intricate puzzles. You play as Philip, trapped in an underground research facility in Greenland while being taunted by Clarence—a malevolent split-personality born from an infection. Core Survival Strategies