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{{Languages|zh|道具球}}
{{Distinguish|This article is about the '''Prop Ball''' which is not directly controlled by the player. See '''[[ball]]''' for the balls that players can directly control. }}
{{Object
  |name = Prop ball
  | img = [[File:三种球.jpg|280px]]
  | desc = The appearance of the three prop balls is almost the same as the three player balls, except that the prop stone balls are slightly brighter.
  | module = P_Ball_Stone, P_Ball_Wood, P_Ball_Paper
  | appearance = any level except level 7, 8
}}
'''Prop balls''', are balls that appears as [[object]]s and cannot be directly controlled by the player.

== Introduction ==

The prop ball is almost identical to the [[player ball]] in appearance, but there are differences in physical properties. Specifically in:

* The prop balls will appear or disappear according to the section it is in (the basic nature of objects).
* The prop balls will not trigger [[checkpoint]]s, [[balloon]]s, or [[transformer]].
* The prop balls cannot be blown up by a [[ventilator]], no matter what kind of prop ball it is, or how many fans are stacked.
* Part of the physical parameter data of the prop ball is different from that of the player ball.
* The prop stone ball cannot break [[suspension bridge]].
* Prop stone balls are actually a bit shinier than player stone balls, but the textures are exactly the same.
* Prop balls do not produce [[shadow]]s.

== Purpose ==

The prop wooden and paper balls can be used as obstacles to block the player's paper balls and wooden balls; they can be used as props for paving the way like [[box]]es; or just as decorations.

The use of prop stone balls is more extensive. Combined with favorable terrain, it can easily block the player's paper balls and wooden balls, and a slightly larger number can block the player's stone balls; it can also be used as a road pad or as a decoration; it can even be used as a very dangerous aggressive trap, such as in level 4 section 3. But the use is more to use them to push away obstacles in positions that are difficult for player balls to reach.

== Physical parameters ==

The physical properties of the three prop balls are given below (the orange and bold are different from the player ball):
{| class="wikitable"
|-
!scope="col"| object
!scope="col"| hitbox diameter (m)
!scope="col"| friction
!scope="col"| flex
!scope="col"| mass/ton
!scope="col"| linear damping
!scope="col"| rotation damping
|-
!scope="row"| Prop stone ball
| 4.0
| {{Orange|'''0.7'''}}
| 0.1
| 10.0
| {{Orange|'''0.2'''}}
| 0.1
|-
|-
! scope="row"| Prop wooden ball
| 4.0
| {{Orange|'''0.6'''}}
| 0.2
| {{Orange|'''2.0'''}}
| {{Orange|'''0.6'''}}
| 0.1
|-
!scope="row"| Prop paper ball
| Mean 4.0, maximum 5.0
| 0.5
| 0.4
| 0.2
| 1.5
| 0.1
|}

For comparison, the physical parameters of the '''part''' of [[Player Ball]] are given below for reference:
{| class="wikitable"
|-
!scope="col"| object
!scope="col"| hitbox diameter (m)
!scope="col"| friction
!scope="col"| flex
!scope="col"| mass/ton
!scope="col"| linear damping
!scope="col"| rotation damping
|-
!scope="row"| stone ball
| 4.0
| 0.5
| 0.1
| 10.0
| 0.3
| 0.1
|-
!scope="row"| wooden ball
| 4.0
| 0.8
| 0.2
| 1.9
| 0.9
| 0.1
|-
!scope="row"| paper ball
| Mean 4.0, maximum 5.0
| 0.5
| 0.4
| 0.2
| 1.5
| 0.1
|}

== Did you know ==

* After pushing down the prop wooden ball at the end of the level 1 section 1, after entering the second section and returning, it was found that the prop wooden ball did not disappear. This is because there is a new prop wooden ball at the same position in the second measure, creating a feeling of "the ball has passed the measure but has not disappeared" (if this wooden ball wasn't there, then falling in that hole would be a ''[[non possum mori]]'' )
* At the beginning of the level 13 section 2, there is a new stone ball under the [[checkpoint]], which just connects with the prop stone ball in the first section, and also creates an effect where the prop ball does not disappear.
* Players can try to deliberately push the prop ball into [[balloon]], but after that, they generally cannot push the prop ball away by normal means, nor can they trigger a [[pass]]. This state may also cause the spacecraft's balloon to [[jerk]].

{{Objects}}