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Fight through the Wild West in 'Call of Juarez' prequel
Most first-person shooters take place in a futuristic world, involving fighting against aliens, mechanical warriors and other hellish creatures. There are exceptions, such as the first three Call of Duty World War II-themed games, but for every one of these historical titles there are a dozen sci-fi shooters, including games like Halo,Half-Life,Doom,Dead Space,Bioshock and Left 4 Dead. Ref. Source 6