...what if you could make a door that was solid but never opened, like an illusion, only you could pass through it. Or a door thats alive.
And it would swallow the intruder then they would be transported through a tube that places them wherever the tube ends!
Finally! A game that implements more than one or two doors to have. I agree with the suggestion, my houses in Terraria looked really ugly with the amount of wooden doors in it, I even got to the option of having no doors.