are in the distance and are for decoration, lacking any collision detection. For example, in Tony Hawk's Underground 2, in the L.A. level there is a glitch that can allow players to leave the provided play area and pass through the background. The massively multiplayer online game Need for Speed: World also had a bug in the city Rockport, where the player can glitch into point Camden near the Bay Bridge. Clipping is exploited by speedrunners to engage in sequence breaking in games like Metroid Prime, which can cause them to behave abnormally especially if they have no code to address it. Players may fall into a bottomless pit by glitching through a wall if there is no ground collision. Such glitches can also allow players to go to areas that they are not supposed to go, such as entering beta areas in Grand Theft Auto IV by using a helicopter to clip through the ground and under the map. Another common type of glitch is item manipulation, where a player can manipulate their inventory to get certain items. This can also be expanded to changing the player's health, magic power, inventory capacity, quest status, item durability, and so on. These manipulations are often not limited by the game's set boundaries, and allow the player to access glitched items. Players can obtain a very high amount of resources just by trying to acquire negative values for certain resource counters that are not coded to handle them. One example of this bug is in the PlayStation 3 and Xbox 360 versions of FIFA 11, in which the game does not check for negative values for the player's currency counter, meaning that if a player cancels a loan and there is not enough currency available in the transfer budget, the currency counter will roll over back to the highest number, granting the player a large amount of wealth. Glitches can also affect the physics of particular games, which can alter the state of gravity, movement speed, or even allow teleportation. A famous physics bug is found in Grand Theft Auto IV, in which a particular swingset can violently catapult anyone and anything that touches its chains or approaches its top bar for a great distance, due to coding flaws concerning the physics of the swing chains. Grand Theft Auto III and Grand Theft Auto V also have a similar physics bug where