Spirit Stones is a free-to-play mobile game with a mixture of card collection, RPG and match-3 elements. You collect cards that represent characters from different classes and use them to fight monsters by connecting 3 or more coloured bubbles. Each bubble colour represents another character class and enhances this classes damage.
You can fight together with your friends to defeat Hellbosses, very tough monsters that can only be defeated in cooperation. Or you can fight your friends in PVP style for emblems, that you can trade in for better and stronger cards.