If you own a 3DS (or a variant of that), you probably have come across this game (because it's free). It's a match-three puzzle game that has similarities with Candy Crush Saga, there are several differerences but I think it gives you enough ideas on what sort of game you can expect.
Anyways, while it's yet another "Free to Play with in-App Purchases" puzzle game, I think it's interesting to see Nintendo releasing their first smartphone game.
http://www.popsci.com.au/gadgets/gaming/pok233mon-shuffle-is…
Just to be clear, this is not made by DeNa and not part of that partnership with Nintendo.
Besides that it's a decent game, i never spent rl money on it. Played it for a while but got a bit sick of it when you are unable to beat those hard ones.