To get the full sets (for the beginner and advanced kyu there are 60 problems), you have to make an in-app purchase of 0.99$ (0.79€)
The app is pretty smooth, and although I found the price high at first, it's just 0.015$ for problem, which is a good deal for tsumego. It's compatible with iOS 4.2, so you can play in your iPod Touches 2nd gen (like mine
)There's also another app (by a korean, I can't remember the name right now), which also offers a free trial (6 levels and 30 trial problems), whereas the full version offers 300 problems per level (1800 total) for (I think) 5.99$ 4.99€ I say "I think" because there are several apps by the same developer, and although three are marked as 1-2-3 (priced 2.99), there's another one priced like this without numbers: I assume it's the full version, but who knows? If someone does, please let me know
This one is only compatible with iOS 4.3 or later, and has a bug in one of the problems (ko in the edge -> application exits).I'll add the Nihon Kiin app to my Go app review queue for whatsoniphone.com, stay tuned to the category "baduk"