Yeah, they literally launch it one after another and so on. To stay updated with such promotions better join their telegram account. You will usually get instant notifications about all the small to big promotions that are in play. More or less few small hunts will also be there to earn extra bucks on the way. I am not sure but the 15 cents promo is ended long ago or at least I have not seen it lately. Otherwise on daily basis they used to give away these promo codes for few hundreds. You might think its small amount, but it was worth try and you could turn it into couple of ten's just like that by playing crash or dice. It was one of my favorite but I am more into their sports betting now.
I am more concerned about these art contest and whenever there is one I am updated as keep check with @Hhampuz post regularly to see the new updates and ongoing such promotion from different casinos he's managing at the time.Have not joined telegram but can check for other promotions from Twitter which is fine for me but yes who are interested in more updates can join telegram.