Yeah, as far I as was aware it was a rule that needing missiles to clear a room was a big no-no -- however, I don't think this was ever officially spelled out or anything, which is why there's a bit of confusion. So, it may just have been a rule in my mind, heh. Perhaps Misery should add this to his room guidelines notes. Back in the day, if missiles were required to clear rooms then the game would spawn a new missile -- incredibly hacky design -- so thankfully needing missiles to clear rooms was removed completely. Going forward, it should certainly be a more official rule, I think.