Metro game series, post-apocalyptic setting, male protagonist, Artyom, gas mask, rugged, holding rifle, underground tunnels, Moscow Metro, dimly lit, abandoned stations, mutant creatures, stealth action, atmospheric, decaying structures, rusted trains, survival gear, military vest, leather boots, first-person perspective, intense combat, eerie shadows, flickering lights, cold breath visible, 3/4 view, detailed textures, immersive environment, snow-covered surface, desolate landscape, dystopian world, high contrast lighting, cinematic angle.