How do I get rubies?

You can get rubies:

●       as a reward for completing all 20 levels in a one-week event;
●       as a reward for completing 30, 50, 60, and 70 levels in a two-week event;
●       as a potential reward when opening a Gold Chest (the chest does not always contain them);
●       for attaining the third reward in your personal goals in the Airship Race tournament;
●       for attaining the third reward in your personal goals in the Pioneers Club tournament;
●       for finishing in first place in a League (Silver or higher);
●       in the Clocksville Express event upon reaching the fifth station;
●       in a daily gift (the gift does not always contain them);
●       by making an in-game purchase with real money from the Bank, Safe, and special offers.