def load_images(self):
     Arena.load_image(self.sprite_sheet)
     Bomb.load_image(self.sprite_sheet)
     Enemy.load_image(self.sprite_sheet)
     Explosion.load_image(self.sprite_sheet)
     Plane.load_image(self.sprite_sheet)
     PlaneExplosion.load_image(self.sprite_sheet)
     Shot.load_image(self.sprite_sheet)
 def load_images(self):
     Alien.load_image()
     Beam.load_image()
     Explosion.load_image()
     Player.load_image()
     Shot.load_image()