Almost every action-adventure game has an unrealistic health system. In Gears of War, for instance, you can take a shockingly high number of bullets (at least on the standard difficulty) before your hero starts to crawl along the floor. Halo: Combat Evolved has regenerating health, and countless games have some kind of insta-healing med kit. You might think that treasure hunter Nathan Drake falls into the same boat, but it turns out the Uncharted franchise has a different health system entirely. That red ring around the screen? It doesn't represent damage, but the hero's luck.