Problem

[Datguy5]

I dont think this affects much,but change this PlaySoundAtEntity("", "unlock_door.snt", "Door_3", 0, false); to
PlaySoundAtEntity("", "unlock_door", "Door_3", 0, false);
I just removed the snt from the end.Thats how its in my script and it works fine.Can you show us the whole script(if it has something else).

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Also check the names in the level editor.

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Everything works well. But when I try to open the door with the key, it does not open

so its still locked after you use the key on it?

I think he means that when he tries to use the key on the door,it says cannot use item this way.