Avernum: Escape From the Pit HD is an epic, indie fantasy role-playing adventure. It is optimized for the iPad and features an enormous world, a fascinating story, and 30+ hours of gameplay.
This bad boy gets 5/5 after 53 user ratings. Not too shabby at all. Avernum: Escape from the Pit HD, was £6.99, now £2.99 at the App Store.
Compatibility: Requires iOS 5.0 or later. Compatible with iPad.