Quick definition:A mechanic that hides parts of the map the player has not explored or cannot currently see, so that enemy positions and movements remain unknown.
Meaning
Fog of war limits how much of the map a player can see. Areas that have never been visited are usually shown as black, and areas outside the sight range of the player's units or buildings are hidden or covered in a grey haze, so that enemy activity there cannot be tracked.
The mechanic makes information valuable. Scouts, watchtowers and special abilities that reveal the map become worth using, and a player who guesses well about what the opponent is doing can set an ambush or prepare a defence. It also makes surprise attacks and hidden expansions possible, which adds tension to long matches.
In online games, designers may stop hidden information being sent to a player's computer at all, so that cheating tools cannot reveal enemy positions. Single-player titles may relax the rules to keep play simple.
Origin:The phrase comes from military writing and refers to the uncertainty commanders face about what is happening on a battlefield. It is often linked to the Prussian writer Carl von Clausewitz, though the exact wording is not clearly his. Strategy games borrowed it to describe the hidden or darkened areas of their maps.
Example:Early in a strategy match, Omar's map is almost entirely black. He sends a scout east and a patch of terrain lights up, revealing a river and a distant farm. When the scout moves on, the area dims again, and Omar realises he cannot tell whether enemy soldiers have moved in behind it.
Did you know?Some games use two layers: unexplored areas stay black, while explored but currently unseen areas show terrain but no units. Others deliberately remove fog of war, giving all players a full view, which changes how scouting and surprise work.
