Floor 16:
-Tap on the screwdriver to collect it.
-Tap on the screwdriver from within your inventory.
-Tap on each of the screws one after another to unscrew them.
-Tap on the plate with the 4 square holes in it, to collect it.
-Turn your device upside down (i.e. with the top of the screen pointing downwards so that the trees appear right-side up) to open the door.
Next Level: 100 Floors Floor 17 Walkthrough
See 100 Floor Walkthrough/Solutions to all floors