You got one of your answers wrong 1SO. I figured you had because I was facing a logical impossibility, so I checked the answer and this:
The Invisible Man
The Hunt
The Platform
Gretel and Hansel
Underwater
4 Correct Titles
1 of them in the Correct Place
should say 4 correct titles, 2 in the correct place. I'll let someone else figure it out from there if they want.
@Fly: I think popularity is just activity, ie how many ratings, likes, reviews and how many times it was added to a list? Maybe rating also comes into account, but it's not the main factor at all. For instance the most popular title from 2016 I haven't seen is Suicide Squad, because it's the 10th most popular film overall from that year, despite quite a low rating of 2.1.