Unreal Free Roam Engine
Although the unreal engine has the capablility of running an open world game (an example would be The Wheelman) i would avoid it unless it was done properly. Fuel was made quite well but something about it just didn't click for me especially when playing free roam, i guess i just lost interest in it fast. Also the level of detail would drop considerably for free roam maps mainly because of there size and roaming on a tiny map is just silly.
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