Waves are a type of obstacle in Paper Mario: The Thousand-Year Door. In the Pirate's Grotto, Mario needs to be in Boat Mode to swim around the waves in order to reach the other side. If Mario touches one, it will hinder his path and force him back to the start.
- Thomason, Steve. Paper Mario: The Thousand Year Door Player's Guide. Page 63. "As you continue to sail east, you'll run into som pretty harrowing surf. Navigate around the waves, or they'll overturn your wee vessel and carry you back to point 12."