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| data3 = All levels
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'''Stopper''' is the common name for objects in the ''Phys_FloorStopper'' [[group]]. It is a type of physical floor and is only effective for entities (including most [[moduleobject]]s and [[prop ball]]s) other than the [[player ball]]. Since its [[collision group]] is the same as the player ball, the latter just ignores and gets through it on "contact".
== Functions ==
Stoppers exist at the end of [[floor]]s in [[default level]]s, in the shape of a small piece of wood below the floor level, to support various kinds of modules objects that are able to be knocked down. Though is the most common type of Stopper, just like floors and [[rail]]s, every 3D model that is sent to the Stopper group works correctly as a Stopper.
Stoppers in other forms are all hidden (for example, some stoppers in Level 13).
Stoppers are effective to all entities other than the player ball, which leads to its frequent appearance in moduleobject-only designs in [[custom level]]s, especially to modules objects that ignore normal floors. Stoppers in this form are usually hidden or in the same shape as floors.
Stoppers can also be made into prop-ball-only paths; however, this design is generally considered tricking. Therefore, stoppers of this type in custom levels are usually highlighted (such as using different [[textures]] or with a warning sign) to tell the player not to try to go through them. Since the probable problems, this design is rare in today's custom levels.
=== Standard Wooden Stopper ===
0.5 meters thick，5 thick (0.1 units)，5 meters wide，1 wide (1 unit)，1 meter long(0.2 units), with shorter bottom edge length 0.5 m(0.1 units); it is usually placed 0.5 m (0.1 units) below the top surface of normal [[floor]]s.
== Did you know ==
* When stoppers are touched by [[moduleobject]]s, a wooden [[sound effect]] is produced. hovever, producing that sound does not need the stopper to be in any extra sound effect groups.
* Despite the existence of the sound effect, only the first stopper in the same level (the first in the Phys_FloorStopper group) is able to produce sound effects. Though this means that a hidden stopper without sound effects can be made, all stoppers that need sound effects in the same level must be attached into the same object and be firstly sent into the Phys_FloorStopper group.
* The [[guard rail]] for blocking the sandbags in the third section of Level 13 is actually a series of guard rails (grouped as Phys_FloorRails) and a stopper of the same model. The stopper is named as the standard "Floor_Stopper". Therefore, [[sandbag]]s produces the special impact sound on contact of the guard rails; similarly, the guard rails that block [[turnstile]]s in the 4th [[sectorsection]] is actually a stopper.
* Just like floors, [[shadow]]s can be added to stoppers. However, stoppers in default levels do not have shadows for unknown reasons.