On the final boss of the game he is going to pit three of the elements against you. Fire, Water, and Air. Although it is easy I suggest having a lot of lives so that you don't have to restart the entire last level. In the Fire level you have to dodge fireballs and get the 5 coins. In the eater level you have to dodge ice shards and get the 5 coins. In the air level you have to run away from the flipping panels.