What is the Fog of War?
Every tile has three different states it can be in: visible (you have explored this tile and can currently see it, whether you have that tile within your territory or you have a unit on that tile, etc.), fog of war (meaning you have previously discovered this tile, but it is not currently visible. For example, most tiles that aren’t inside your territory are part of the fog of war.), and unknown (basically you have no knowledge of what type of tile it is). All unknown tiles are black – in the beginning of the game, almost every tile is unknown! Visible tiles are brighter than tiles in the fog of war, although in the fog of war you can still see each tile as well as other features such as terrain and resources. Keep in mind, however, that the state of a tile (e.g. it’s tile improvement, or road status, etc.) maybe have changed if it’s in the fog of war. The fog of war simply represents the state of a discovered tile as you last saw it. Also, barbarian units can spawn in any tile that is
