Indie Wrestler is a full-fledge mobile game developer in Unity. It contains all sorts of features: in-app purchases, user profile management, notifications, analytics, and everything else you can expect on the technical side of a solid mobile game.
In it, you play the role of an independent wrestler, climbing up his way to the top. There's a lot of strategy envolved, different sorts of mini-games, narration and many other elements that bring the game into life.
As much as it was a challenge due to the amount of features that are in it, it is also very rewarding to see the game finished and released as a solid and well-thought product.