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For 2018 I'm looking forward to State of Decay 2, Days Gone and Shadow of the Collossus would be in my wishlist if they are not PS4 exclusive. And I will choose one pirate game between Sea of Thieves or Skull and Bones. And... Anthem looks dope. But I'm gonna need to learn about these games further.
How about you? Maybe you know better open world games than these? If you do, I'd like to hear it.

Personally, I'd die for a Red Dead Redemption 2 :)

Days gone seems pretty cool, also!

Oh right, Red Dead Redemption 2! That game is also could be in my wishlist.. If it's available for PC