It is free and has a 4.95/5 rating on Google Play. Can't really beat that. When I first played it I thought it was going to be a waste of time but it really impressed me. What makes it a treat is that it is long, well written (typos are there but the actual style, organisation and creative thought is throughout), and there is strategic combat, both in terms of single combat and actual sieges etc. If you love the book in Way of the Tiger where you manage the castle, this book has a huge part where you manage towns villages etc.
I am not a fan of smart phones, yeah I know i'm lame, but this app has drained hours upon hours from me. Highly recommended, and I would love to hear anybody else's thoughts on it tbh.