It's unclear whether this cryptocurrency is actually based on blockchain tech, or if it's just a virtual currency as is quite common nowadays?
i got the same question in my head but btw do you visit the link ? i havent yet but the link should provide some details or you already visit them but still cant find answer to your question .
you are right that games have a common currency like for example gems . you can earn them rarely or you can buy them using your prepaid load or other payment option such as credit card , paypal , etc . but maybe they are using some kind of crypto related currency and only be relaodable via crypto transaction too .