I would choose GTA V and Left for dead 1 because a big open world full of weapons, vehicles and more fighting zombies and sepcial infected - No goals but to fu** some zombies up.
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I'd have the GTA concept, but set in the Star Wars universe. You can do missions, or just do your own thing. You can use a bunch of Star Wars weapons and equipment, as well as drive vehicles, fly ships, or tame and ride creatures. And I would have the option to be good or evil with different career choices, not just being a criminal like in GTA.1