[SCRIPT] How to make something happen in the after doing something in another level.

[Radical Batz]

This may be hard to explain but I'll tell you in detail.

I have this door in a map which is a gate and it's locked, so you go in this level door/other map. and when you finished puzzle in that map and return to the old map, then something has happened. The door has been opened.

What I'm trying to say is, How do you make something happen in a map when you did something in another map. uuuuuuh this is hard to explain. I am trying to make something happen in the level where everything is safe and the door is locked but when you have solved a puzzle or did anything in another level then when you enter the old map again some thing appears and the door is unlocked.

Very similar when you finished the puzzle in the machine room. elevator doors open and the shadow starts appearing, only when you finished the puzzle in the other level. There I hope you understand what I'm trying to say.

So pls tell me what's that code to do that or what I'm supposed to do plss. thanks