I wanted this to be the last round of this specific game organized by me, so I used all the images that I considered to be interesting. I would like to either play or organize a different kind of game in the future. 
In my opinion the most difficult image in that thread is the out-of-contest one that I published in this post.
I you havenāt already read (in the subsequent posts) what that āthingā is, Iām sure that it could represent an interesting puzzle for you.