/home/user/.var/app/com.play0ad.zeroad/data/0ad/saves
is apparently where they are saved. I haven't deleted them yet and check but I can see quite a few files that looks like them. Thanks for the tip about flatpak, I searched the web and found some one asking where did his files go on a different program. Might I suggest that this be added to the wiki, can I do it or does a more privileged person has needed.
P.S> All the yellow bricks have been re purposed to smash windows during our peaceful demonstrations we have today. Unfortunately our government could not reach a agreementon how to repair the road. Some even suggested that it would be better to leave it the way it is now to cut down on emissions.