Skullwaker on 10 July 2015
If you consider yourself a casual gamer, then I would definitely pick up Mario Kart 8, Super Smash Bros. for Wii U, Splatoon and Super Mario 3D World (not to say that the games themselves are casual, but they're very easy to pick up and play). Donkey Kong Country is pretty difficult, but great nonetheless.
I'd also have a look out for Yoshi's Woolly World, Super Mario Maker and Xenoblade Chronicles X (it's like a JRPG and WRPG mixed together).
Edit: And I'll always recommend Wind Waker HD. It's a perfect first Zelda game.
