CryptoConnex was made for iPhone and uses CoreData for persistence. I was the sole developer and came up with all the level data which is stored in a plist file. After completion I psuedo-coded and documented every part of the app, so the Android team could implement it easily on their side afterwards.
CryptoConnex was one of three iOS apps that we worked on for Apps For Good to wireframe, design and then develop for groups of school kids across the United Kingdom that had won their school level competition for coming up with a useful app idea.
CryptoConnex is available for free on the App Store.