Link Between Worlds is the first 3DS Zelda title, as well as a sequel to Link to the Past, although the story, dungeons, and mechanics are entirely original.
Link Between Worlds lets the player tackle most of its dungeons in any order, as Link doesn't find his main items in the dungeons but instead must "rent" them from the merchant, Ravio. Link will lose these items if he dies, but later in the game he can buy them to keep.
Similar to Link to the Past, Link Between Worlds has a light world (Hyrule) and a dark world (Lorule), and Link must traverse both to complete the game. A major part of the gameplay revolves around Link's ability to "merge" into certain walls which allows him to move past areas he would be otherwise unable to. It also allows Link to enter dimension cracks to travel between Hyrule and Lorule.