supertux/data/images/creatures/mr_rocket/explosion.sprite

(supertux-sprite
 (action
  (name "explosion-left")
  (fps 15.0)
  (hitbox 0 32 31.8 31.8)
  (images "explosion-0.png"
   "explosion-1.png")
 )
 (action
  (name "explosion-right")
  (fps 15.0)
  (hitbox 0 32 31.8 31.8)
  (mirror-action "explosion-left")
 )
)