Marrun (マールン) is a pill bug-like Badnik that appears in Sonic Advance 3. It is similar to the Dango from Sonic the Hedgehog CD in design and function.
This Badnik only appears in Chaos Angel where it waits for the player to approach, then quickly curls up into a ball and rolls into them. The player must act quickly and take them out as soon as they encounter them, as direct attacks will no longer work once they curl up. Some indirect attacks, such as Amy's Hammer Attack or Cream's Chao Attack, can still destroy them even when they are curled up.