Topic on Talk:Halo: The Master Chief Collection
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Certain UE4 INI Tweaks do impact the game such as the "GraphicsQualityThrottles[i]" array as well as UE4 variables such as "GameResolutionScale" in the GameUserSettings.ini. From the former it is safe to assume that all settings that use an array index call back to the Blam! Engine, but validity of the latter vars will need to be reviewed case by case.