Go right 2 times, then up, up again to unlock the door, use the gold key. We are getting closer! Click the drawer to look inside, take the scissors. Now, head back to D, use the scissors to cut the rose, one to be precise! Then take the yellow gem.
Now go right, use the lighter to light the one and only candle, just asking to be lit! You will get a purple gem.
After all of that, to room U. Click the picture and arrange the tiles to make the picture shown below!
Up next we will find the clue to unlock the safe!