Rewarded videos are ads you can watch when you lack energy to regain small amounts of energy. This feature can only be used a certain amount of times.
What are diamonds?
Diamonds are an in-game currency that enables you to purchase Special Episodes.
How can I get diamonds?
Diamonds can be bought in the Special Episodes BOUTIQUE on the main screen. You will also receive diamonds as a reward for completing an episode on the main story line or when unlocking 2 souvenirs of one episode.