Difficulties - Difficult and Impossible.

Renvard, the difficulty of a map in the editor depends on the map creator. That is, if they believe they have created a difficult map, they will set the difficulty to "difficult." If it's some kind of impossible mess, they will set it to "impossible." Players won't play any better or worse because of this.

Since the AI's strength in the game is already determined by the starting conditions in the game itself (and the editor is only for previewing), this won't change anything.