The Howling Moons are a bunch of wolf-themed bikers, and they present the first serious challenge for you. They will send their wolf robots after you, and your bike unlocks a new upgrade: cannons! You can fire away at the wolves to destroy them, and they are worth a good amount of points. You will need to destroy as many as you can if you want the gold rank, as they follow the same rule of hearts: the more you destroy, the more points they are worth. During the fight with the big robot mech, you will have to shoot the barrels to destroy them for score. Dodge the green fireballs and you will get the chance to attack the mech directly.