To edit this source code and make your own game you should follow some simple step
1. Open file gamedata.plist inside Resources folder
2. In this file by expanding root dictionary you can dictionary iphoneData .it contain array (LavelArray) you can edit and add new level by edit item value or adding new item
3. Item contain following data:-
id = 1 (it is level no make it in sequence)
answer = Pencillead ( do not put space between answer . answer is less than 12 character)
Hint=i can write
4. For change inapp Purchases you should change
#define Buy1000Coin @""
#define Buy2500Coin @""
#define Buy6000Coin @""
#define Buy20000Coin @""
inside the Global1.h file