post-apocalyptic setting, Moscow Metro, dark tunnels, dimly lit stations, survival horror, first-person shooter, gas mask, scavenging, mutant creatures, atmospheric tension, stealth gameplay, scarce ammunition, immersive story, Russian literature, moral choices, alternate endings, claustrophobic environment, dynamic lighting, shadowy figures, eerie soundtrack, NPC interactions, underground society, faction warfare, supernatural elements, decaying infrastructure, 4A Games, detailed textures, gritty realism, voice acting, narrative-driven, environmental storytelling, desolate surface ruins, toxic atmosphere, survival mechanics, resource management, psychological thriller, intense combat encounters, cultural references, enhanced graphics, remastered edition, high replay value.