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The underground pipes resemble regular pipes, though their appearance differs between the versions of Sonic Colors; in the Wii version, the underground pipes are green with red rims and white arrows at the ends, while in the Nintendo DS version they look like simple brown pipes with streaks of green.
The underground pipes are, as their name would imply, located underground and underwater. They can only be accessed when Sonic is transformed into the Yellow Drill, by obtaining a Yellow Wisp and utilizing its Color Power.
When going through an underground pipe, Sonic can travel far distances at an instance, allowing the player to take shortcuts through the Acts and even enter sections or areas that would otherwise be inaccessible at the given point.