Cataclysm: Dark Days Ahead

If you're willing to put in the time and patience, however, Cataclysm: Dark Days Ahead is among the best roguelikes currently available on the App Store. It's something you could find yourself playing for literal months if not longer, and it doesn't cost a thing. All of that is probably worth a little (okay, a lot) of discomfort with the control set-up.