This tends to be a hardcore difficulty setting that is added to some action games and RPG titles. This is where the player will need to play through the typical game experience but with added survival aspects to consider. For example, you may play through an RPG and have to complete quests, build your character, and gather loot. However, in survival mode, you will also need to feed your hunger, quell your thirst, and usually, you will be much more flimsy, so you can't just run into gunfights and absorb hits like a bullet sponge. It's a fun way to play games and often provides a new perspective on games that you thought you knew inside and out.