trying to extrude but keep failing>< finally can extrude but dont know why the wall of upper floor cant extrude well(didnt cap itself).... try n try n try but cant, really wanna kill the programme ady! but since maybe always need use this programme in the future, so try to love this programme. So don care that part and doing others 1st. I already try extrude as many as i can but found 1 problem.... due to the floor level of every space are different, how i gonna extrude it out><... i think can using same method as the wall but I almost get confused when doing the wall part, so hope the floor part wont make me get crazy. Hope can finish in timeTT^TT...