After progressing through the game and getting passed major story elements, is it possible to later go back and obtain any collectables that I might have missed? Are there any limitations to any free roam abilities if it is possible to do this?
There is a sort of free roam mode in chapter 16 that will give you a window to go back to the past areas in the game to obtain some of the things that you might have missed. This is only available for a short time during the story though and once you have progressed beyond this point, you will no longer be able to go back again.
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