Pixel hunting is not my favorite gameplay type. However the 10 Gnomes series is very well made. The ambient sound and black and white photo background create a surreal feeling that makes you believe Gnomes could really exist and hide all around us. These games make you look at world with different eyes, letting player discover the world from a different perspective and seeing how various human made items, mostly abandoned ones could be used by beings of different (spatial) dimensions. My baseline score for all 10 Gnomes games is 7/10, for great artistic design and rather unique design, but only a medium level of gameplay. I myself have found all the gnomes in all these games, but usually just about 7 or 8 from the first try.
This, fourth episode is also one of the hardest in series. One reason for that is a large amount of zoom in photos that contain many seemingly perfect hiding places that turn out to be empty. The other reason for that is a rather messy and unintuitive navigation. So one good and one bad reason or difficulty. The environment is not very inspiring, while it is on rooftop, you hardly see any great panorama, but are mostly looking at dirty, spotty surfaces. One of my least favorite episodes, I subtract a halfstar from my base 10 Gnomes rating, making this 6/10.