The recent console follow-up Metro Last Light is better known, but for the real primo scares, you have to go back to the source. Based off the novel of the same name by Dmitry Glukhovsky, Metro 2033 sees you controlling the young soldier Artyom who struggles to survive in a post-apocalyptic Russia where, following a nuclear war, the remaining population had to go live in the subway system in order to avoid the fallout (and ensuing terrifying mutant monsters that took over the surface). The first game especially is noted for its levels of immersion, with nary a health bar nor ammo gauge on the screen; in fact, there's no HUD at all. You kinda have to just guess. Lacking those luxuries just goes to make you feel even more helpless when, after a brief period where you're sent on missions throughout the Metro system, you actually have to make a brief sojourn to the surface. In order to survive up there you have to wear a gas mask which, again, you're never sure when it is about to run out - you play it by ear. Which is stressful enough before you take into account the eerie silence that pervades the ruined streets of Moscow, occasionally pierced by a high-pitched, metallic squeal (like a broken car door, only way louder), which heralds the arrival of... well, you're never quite sure. Terrifying enough in the game itself, even more so when you hear similar noises outside your bedroom window after turning your computer off.
