You placed a comment on one of my maps quite a while ago asking how to do a certain glitch. I call it the one-use platform, others have named it differently..
To create this glitch you place a normal door on the map, then you place an open door ontop of it and put the switch in the middle of the platform.
SkyRay
To create this glitch you place a normal door on the map, then you place an open door ontop of it and put the switch in the middle of the platform.