From the Super Mario Wiki
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The Ruin Floor is located on the second floor balcony of the temple, near the D-Cell Battery and Big Shiny Baahammer. After Mario collects the scrap, he must drop down to the floor below and enter the door. Using Paperization, he must patch the empty space nearby, fixing the floor. He must then hammer the top of the ruin floor, allowing him to drop through and get past the saw blades above.