I was thinking that music could be a distraction, and if anyone wanted music they could just open Spotify or something. I could look into getting a track commissioned for the game if that's something people would be interested in?
This is called Chording, flagging like that only works when there are only tiles of that number around the tile. You can see how many there are by the outline around your cursor tile. If there are more or less cells around a number tile than what it sums to, it will not work.
