A:AnswerThe only way to buy digital ps4 copies now is on the Playstation store. No retailer carries digital copies anymore for the Playstation platform.
A:AnswerYes! There are multiple difficulty levels to select upon starting the game. I believe there is one that is story only, then basic 1st play through level, then a little bit harder, and the max level is kicked up a few notches, meaning you have to eat to stay alive etc.