It is a completely FTP game where you can earn diamonds by completing the puzzles (a great bonus, and something to do while waiting for the HOS's to cooldown), and you can receive them in other ways too, which you will learn as you go along, you earn coins by completing the HOS's, finishing quests/tasks and many more ways.so you will 'never' have to pay real money for anything.
There are plenty of things to do while you wait for the cooldown timer (once a HOS is complete you will need to wait a while before you can replay it). The more you level up the more HOS's become available. So it is first and foremost a HOS game with quests and tasks to complete to be able to level up. The graphics/visuals are amazing the sound effects are superb the artwork that has gone into this game is phenomenal. Be prepared to become a MC addict There is nothing about this game that I do not like.