I was just wondering what happens if you have completed all the main quests and have no way of earning diamonds. (Not including buying them, street pass or using the codes beacuse I have done the 3 UK diamond codes).
As of the 1.1 update, since the Changing Land Balloon chooses stages that you have and not ones you don't, if you cannot connect to the Internet and run out of Diamonds without all the Hot-Air Balloons or the Diamond Digger (which can only be bought), the game becomes completely impossible to 100% complete. :P
Hope I Helped!