They can use an unbreakable cricket bat, which does less damage than other weapons. There are several types of zombies, including those which explode, are armored, or spill corrosive fluid. The zombies are sensitive to light, and are attracted to a player who is using a flashlight or flare. Sound produced by firearms will also attract nearby enemies to a player, who can push them away with their weapon. The player can also use stealth to avoid being noticed by enemies. Exploration is encouraged in the game. By exploring the game's world, players can find beds (which are save points) and routes leading them back to their safe houses. New weapons, ammunition, and scarce items can be collected by searching areas or dead bodies. These items include food and medkits (which restore health), plywood scraps (used to barricade doors), and weapon parts (which can be used in the safe house to upgrade weapons). As players discover new items during the game, previously-inaccessible areas can be entered. These items are stored in the player character's inventory (known as a bug-out-bag) or a cache in the safe house. If the player's character is killed by a zombie (which can occur with one bite), the character will permanently die and the player will then assume the role of another survivor. The previous character will become a zombie, whom the player must kill to reclaim their inventory. If Miiverse is enabled, other players' characters may also appear as zombies carrying the items they collected. A player can also place symbolic clues and hints, visible to other players, on walls. In addition to the normal-difficulty mode, ZombiU has a "Chicken" mode, which lowers the game's difficulty, for new and inexperienced players and a survival mode where the game ends when the player's original character dies. The game's controls make extensive use of the Wii U GamePad. During normal play, the touchscreen manages player inventory and displays a mini-map of the immediate area (indicating the locations of the player and nearby enemies). The touchscreen is also used for context-sensitive actions such as executions, escaping from enemies, and hacking combination locks. The GamePad's gyroscope, which allows the controller to sense its rotation and tilt in three-dimensional space, is also used. While viewing the touchscreen, a player can move the controller to scan different areas to find items. While performing these actions, the television's perspective switches to a