'The Legend of Zelda: Breath of the Wild'
Spreading an existing game's formula out over an open world can be a recipe for disaster, but for The Legend of Zelda it turned out to be a perfect match. It's a series that's been heading in this direction since Wind Waker, but Breath of the Wild finally committed. It took the line about Skyrim (“See those mountains? You can climb them”) and followed through on it – rather than terrain just being there you can interact with it, glide over it, climb up it. Even before embarking on a big journey, to reach a shrine at the top of a mountain for instance, you might harvest ingredients and then prepare some stamina-restoring food and stat-buffing elixirs to help you up it. You might even get a good night's sleep to give some extra health in case trouble finds you halfway up. It feels like real travel, considered and planned, and it has a weight that's normally absent in these kind of games. Also, importantly, it is still a game where you can hurl fizzing bombs around.