supertux/data/images/objects/big_snowball/big_snowball.sprite

(supertux-sprite
    (action
      (name "default")
	    (hitbox 6 6 87 84)
      (images "big_snowball.png"))

    (action
      (name "particle")
	    (hitbox 2 2 29 28)
      (images "big_snowball_particle.png"))
)