Linedef type 51
Linedef type 51, Instantly Raise Ceiling on Level Load, is a type of linedef special which makes the tagged sectors' ceilings instantly rise on level load to be the same height as the highest ceiling of any bordering sector. Note that this effect is activated after all Things have been spawned. Thus, it can be used to place Things at heights that are beyond the Z offset range of 4096 fracunits. This effect can also be used for making terrain that appears differently in Single Player and multiplayer games, by using the flags  / Netgame Only or  / No Netgame to disable it selectively.
- Example file: ex_ld051_instantlyraiseceiling.wad (MAP01)
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