Survival horror is a subgenre of action-adventure video game inspired by horror fiction. These games make the player vulnerable by providing them with less ammunition and fewer heavy weapons than other action games. Although combat is a part of the gameplay, the player must ration ammunition by evading enemies and avoiding direct confrontation. The player is also challenged to find items that unlock the path to new areas, and solve puzzles at certain locations. Games make use of strong horror themes, and the player is often challenged to navigate dark maze-like environments, and react to unexpected attacks from enemies.