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(+3)

So, if I get 5's they are supposed to be stacked on top of each other. But what if I rolled only one 5?

(+3)

Only one 5 means it's a very short tower!

The non-glib answer is that the generator fails a bit for some combinations of numbers. Rolling multiple fives means you have a tower, rolling just one makes it just another room and some of the specific rules don't make a ton of sense anymore.