On the floor 64 you might be able to do it, but here I will explain karana likely there are still people who have not been able to do it.
Press the black dot in the magnifier can both doors, doing rounds anti clockwise bike black point until the floor 64 door open.
100 Floors Level 64 Explanation
100 Floors Level 65 Explanation
Go to floor 65: Tap the ball on the floor right next to the ball to pick it up and input into the tube. Now use your fire stick on Burn Detector, fill up the water and the ball will go up to touch the yellow button.
Now continue to the 100 floors level 66-67 explanation, or back to the 100 floors level 62-63 explanation