### How to make something happen when all actors of a certain group [SOLVED]

• Posts: 21
You know The Binding of Isaac It's kind of like that. Where when you enter a room, you need to kill everything in that room before the doors open.  I really don't know how to start doing this. There are multiple different enemy actors in each room, but they all have the group enemy. How would I go about making a door open when all actors of enemy are dead?

« Last Edit: May 26, 2020, 08:43:35 pm by ConquistadorBob »

#### Luyren

• Posts: 2785
Code: [Select]
`Scene BehaviorNumber of Enemies: hidden number attribute.Enemy Group: non-hidden actor group attribute.Updating-Set Number of Enemies to 0----for each actor in group [Enemy Group]----increment Number of Enemies by 1-If Number of Enemies = 0--All enemies have been defeated, do whatever you want here.`You can also make that an actor behavior, if you want to do something to that actor when all enemies are defeated.
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#### CmdrWhitey13

• Posts: 505

• Posts: 21
Code: [Select]
`Scene BehaviorNumber of Enemies: hidden number attribute.Enemy Group: non-hidden actor group attribute.Updating-Set Number of Enemies to 0----for each actor in group [Enemy Group][quote author=Luyren link=topic=60560.msg313855#msg313855 date=1590538272][code]Scene BehaviorNumber of Enemies: hidden number attribute.Enemy Group: non-hidden actor group attribute.Updating-Set Number of Enemies to 0----for each actor in group [Enemy Group]----increment Number of Enemies by 1-If Number of Enemies = 0--All enemies have been defeated, do whatever you want here.`You can also make that an actor behavior, if you want to do something to that actor when all enemies are defeated.
Thanks! I only thought have having a separate behavior for each scene where I manually set a number that goes down when each enemy actor dies. I didn't know how to count the enemy actors automatically. Tysm.