Sid Meier's turn-based franchise Civilization and its spin-off Alpha Centauri obscure parts of the map not occupied by the player or allies until the advent of orbital flight is reached by the player.
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Two of the most successful Blizzard franchises, Warcraft and StarCraft as well as Riot Game's League of Legends, also use a similar fog of war which only reveals terrain features and enemy units through a player's reconnaissance.
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Rather than create a derivative game on the Western Front, Crawford elected to focus the game's design on fog of war and the personalities of American general George Patton and the German Field Marshal Erwin Rommel.