Fixing the trapdoor

LJ loves his duplo castle! It has a working drawbridge and two trapdoors. There are Knights that fight the dragon (or rubber ducky if he is closer).

He will spend ages putting the men (or other things), through the trapdoors and down each level and across the bridge... And once they are out, they have to go back in.

And when something breaks, he has to fix it before the troop movement can continue.