The Last Master has three forms The first two are easy shoot him and kill him The last form is difficult You have to shoot the tank under him and destroy it He will fall down Make sure you hit his face when he falls down His armor is weak when you shoot him However it is difficult to shoot him when he falls down because the gears are moving Be careful as they may crush you When the boss gets up the tank that is under him regenerates and you have to destroy it again Repeat this process until he is defeated Note Shooting his face has no effect