So how it works is that someone posts how they're going to break down the door. Then the OP (me in this case) responds with a post about how the next door has evolved to make it impossible to do it again.
Person 1: "I lockpick the door."
OP: "You successfully pick the lock, but the door to Floor 2 is barricaded from the other side."
Person 2: "I kick the door down."
OP: "The weak wooden door gives way, but the door to Floor 3 is reinforced with metal and barricaded from the other side."
And so on and so forth. If it gets too crazy, I'll start to put the responses behind a [hide].
So yeah, that's about it. We'll start at Floor 3 with a reinforced barricaded door that can't be kicked down or lockpicked. Have fun!