Protect your castle from the rocks that attack you. merge cards to improve your defense and fire your turrets to destroy the rocks. you will earn gold coins that will allow you to get new cards to upgrade your turrets. you can also target the chests during your games to get nice rewards. they will allow you to upgrade your game zone among other things. but be careful, each time you hit your castle you will take damage. do not lose all your health points if you want to complete the levels. set up a strong defense against this avalanche of rocks and try to reach level 25. good luck!