Ball o' String Wario
From the Super Mario Wiki, the Mario encyclopedia
Ball o' String Wario is one of Wario's transformations in Wario Land 3. Getting covered in Silky's or Anonster's spider silk turns the player into Ball o' String Wario, a rolling yellow yarn ball. In this form the player rolls back and forth across a level, bouncing off walls, until they eventually unravel back into Wario. In this state, the player can break through yarn blocks.
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