Just wanted to repeat a previous observation of mine regarding the group closure visuals.

I'm currently on my best run (68K+) and came a cropper of the visual clues. I was looking to close a group with 3 flags in it. Was getting low on tiles and had an opportunity to use a river piece as a closure tile. It can be seen in the screen shot below, to the left of the rail piece. Over the course of several tiles I kept checking the tiles needing to be closed. Not once did I spot the tile 2 above the rail piece !! So when I came to place (what I thought was) the last closure piece I was shocked I didn't get my 15 tiles.

On closer inspection that was when I spotted the last remaining closure spot. And all my planning came crashing down as I found myself with one spot still to close and now, while low on tiles, having to wait for a suitable water piece. (With careful searching I managed to find enough perfects to prolong the game for a water station to appear in my stack and duly closed the group.)

As mentioned, I checked many, many times what needed closing. I think I missed it because of the colour basically matching the background colour so it didn't stand out.

https://ad.gamersky.info/@steamcommunity.com/sharedfiles/filedetails/?id=2578781468


Here's my previous thread on the issue.
https://ad.gamersky.info/@steamcommunity.com/app/1455840/discussions/3/3046104862454295466/

As an additional option, maybe the closure edges can be highlighted in the same way that the flags are when using the 'H' key. IE, have a 'Bat Signal' highlight each position.