In game design, it is considered important to clearly show that the player's character (or other object that they control) is losing health points. In his book "Level Up!: The Guide to Great Video Game Design", game designer Scott Rogers wrote that "health should deplete in an obvious manner, because with every hit, a player is closer to losing their life". As examples of visualizing health loss, Rogers cited Arthur of "Ghosts 'n Goblins", who loses a piece of armor with each sustained hit, as well as the cars in the "Grand Theft Auto" series, in which smoke begins to flow from the hood after the car takes a significant amount of damage.