What kinds of in-game currency are there? May 19, 2023 15:13 There are two types of currency in the game, cash and crystals. Related articles What are crystals used for, and how do I get them? What is cash used for, and how do I get it? Can I complete the game without in-game purchases? How do I buy the currency I need? When I enter my email to save my game progress, I get the error message that "Email address is already in use".