4. Limbo
How about playing a 2D game in the high definition of the iPhone 6 Plus? Limbo is a 2 dimensional side-scroller game where you have to guide your character through a maze of puzzles in order to save his sister. Now the best part about this game is that in order to progress you need to utilize a trial and error method. This will see you try out multiple options and failing before you find the perfect solution. It is quite an enjoyable game.