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I created a method, added to fpsc guide, allowing a door to open if a certain number of enemy in a room were destroyed. This is a situation in some fps games I have played. Shoot a number of enemy in a room allowing level progression (i.e. a door opened).

Variables now make this simple.

Set the following destroy script to each of your enemy. Say you have 3 in a room but the exit door is not open.

:state=0:state=1,globalvar=1
:state=1,alphafadeequal=100:decalphafade=0
:state=1,alphafadeequal=0:state=2,destroy,incvar=1

Add a door and set the following as it's main script:

:state=0:globalvar=1
:state=0,varequal=3:state=1,setframe=0,sound=$0
:state=1:incframe=0
:state=1,frameatend=0:state=2,coloff,setvar=0

Shooting the 3 enemy will open the door. It will stay open.

This requires update 1.09, though. It looks like it should work, though.

Tested and it works fine. You could use variations to trigger other events..not just open doors. Make a key or other item appear in the middle of the room on a pedestal for example.