Game motor for simple sentence guessing game

Objective is to build a very simple game logic for sentence guessing game. Graphics or layouts are not needed. The idea of the game is to guess a mystery sentence, and the sentence is built with words, that are available for the level. There are a lot of levels but only one combination is correct er each level. All the data for each level is loaded from Firebase backend, so that adding new levels is easy afterwards (without updating the app). The app keeps track on completed levels, so that there will never be a same level for the user. IAP system must be built to buy more coins. Simple score system is needed too, and the amount of coins, points and completed & unfinished levels are stored in Game Center (iOS) or other, maybe cross-platform cloud service / backend. Also an ad network integration is needed for interstitial video ads between levels. The app will work in portrait mode. For iOS it would be perfect, if there would be only one storyboard for both, iPhone and iPad, but it is OK to have separate for iPhone /5/6/6plus and iPad. But both are bound to one .m and .h file. As you might understood, Objective-C is the language here. If you are familiar with some simple Firebase integration, simple IAP integration, simple ad network integration and can create working autolayout storyboards with just a few screens and very simple functions, this should be a “walk in the park” for you. :) First we will build this for iOS and then Android. Android building will be another project, but if You do this well, the Android project is a new case for you for sure. I’ve done some coding and published many apps, so I’m not a complete newbie. I can read the code and learn how to do things by that. But for this I need some help to get something ready in a reasonable time. So thats why I and You are here. :) Payments goes like this: 40% when I receive the project files 60% when I’ve managed to put my layouts and other functions in and can test the gameplay with my own Firebase database (based on the specs got rfom you). When this happens, I’ve received a properly working and well enough documented and simple enough to understand game motor, and then I will add my magic into it and continue that work myself. You don’t have to wait for the actual release or anything. I might ask some simple questions of how things work, which I’m hoping to get an answer. If something bigger is needed, we will arrange how we will proceed with that. Please read the detailed info on the spec sheet provided!