Angelus on 20 May 2013
They just need to keep the environments, and surprises they throw at you fresh. Obviously, those who've played the previous games know how they generally need to approach the game, but the challenge really comes from the types of unique, new situations the game can throw at you. Obviously if the areas and enemies are all very similar to the past games it won't be very difficult for us, but if they made fresh designs, it should be fine.
