Slender: The Eight Pages

Slender: The Eight Pages ties its tension to a flashlight battery that never fully runs out but does flicker under pressure, which means managing when to actually use the light matters as much as finding the eight pages scattered through the forest.

Because the forest regenerates its layout and Slender Man's presence intensifies the more pages you collect, later pages genuinely get more dangerous to retrieve than earlier ones, treating the search as escalating rather than uniform difficulty. Checking behind you periodically rather than only looking forward tends to catch Slender Man's approach before he's close enough to end the run outright. Alien's Nest runs a similarly tense exploration-and-avoidance format in a sci-fi hive instead of a haunted forest.