Rise of Berk is a free-to-play village building game from Ludia, the creators of Jurassic Park Builder (another village building game) so you can expect to find similar but different gameplays throughout your journey on Berk.
You will spend most of your game building Berk and collecting amazing new dragons (at least 30 dragons are expected!) to help you collect resources to rebuild Berk. It is expected that a battle system will be put in place in the near future and that's something to look forward to.
I must admit the graphics in Rise of Berk are rad. They have most of the details and coloring down for the dragons to make them look realistic and captivating. The environment of the game is mostly in 3D and is breathtaking for a village building game of its time.
I'm sure all How To Train Your Dragon fans have played multiple mobile games found in their local app store, and rarely do they live up to the franchise. The games are either overdeveloped like School of Dragons mobile where it lags or underdeveloped but Rise of Berk from Ludia is something else. It really captures the inspiration of the dragons from the franchise on a mobile game where you can collect them all.
However, some of the dragons do require purchases of runes to obtain because there is no consistent way of earning runes where you will be able to purchase all of the premium dragons for the game. Other than that you can obtain most of the dragons in the game from normal playthrough but like all Village Building games, it will take a while unless you feel like spending some credits on the game.
Bottom line: Best How To Train Your Dragon mobile game!