or exits to areas, scant instruction given to the player, and encouragement to explore freely. Breath of the Wild introduces a consistent physics engine to the Zelda series, letting players approach problems in different ways rather than trying to find a single solution. The game also integrates a "chemistry engine" that defines the physical properties of most objects and governs how they interact with the player and one another. For example, during thunderstorms, metal objects will attract powerful lightning strikes; during a storm, therefore, a player must be careful not to carry metal, but may also throw metal objects at enemies to draw lightning to them. These design approaches result in a generally unstructured and interactive world that rewards experimentation and allows for nonlinear completion of the story. As Link, players can perform actions such as running, climbing, swimming, and gliding with a paraglider, although Link is limited by his stamina. Link can procure items from the environment, including weapons, food, and other resources. Unlike previous Zelda games, weapons and shields degrade through use, eventually shattering. Many items have multiple uses; for example, wooden weapons can light fires, wooden shields can collect incoming enemy arrows, and shields can be used as makeshift snowboards. Players can obtain food and materials for elixirs from hunting animals, gathering wild fruit, or collecting parts of defeated enemies. By cooking combinations of food or materials, the player can create meals and elixirs that can replenish Link's health and stamina, or provide temporary status bonuses such as increased strength or resistance to heat or cold. An important tool in Link's arsenal is the "Sheikah Slate", a magical stone tablet which can be used to mark waypoints on the in-game map and take pictures of materials, creatures, and enemies. These pictures are stored in an in-game compendium that can be used to locate valuable items. The Sheikah Slate also gives the player the ability to create remote bombs, manipulate metal objects, form ice blocks on watery surfaces, and temporarily stop objects in time. In combat, players can lock onto targets for more precise attacks, while certain button combinations allow for advanced offensive and defensive moves. Players may also defeat enemies without weapons, such as by rolling boulders off cliffs into enemy camps. Besides exploration, players can undergo quests or challenges to obtain certain benefits. Activating towers and shrines will add waypoints to the map that the player