Urchin Shoals, or Sparkling Waters-4, is the fourth level of Sparkling Waters in New Super Mario Bros. U. It is unlocked via completion of Haunted Shipwreck, and its own completion unlocks Dragoneel's Undersea Grotto. It is the location of the third Nabbit chase.
Like Waterspout Beach and Above the Cheep Cheep Sea, this level contains many Waterspouts. The level begins with a Waterspout with a Mega Urchin on it. A Goomba is found, along with another Mega Urchin on a Waterspout, found under a ? Block containing a power-up. A group of five Waterspouts follows, some of which have Urchins on them. Koopa Troopas are also found. A row of Donut Blocks is found above a Mega Urchin, and causes them to fall allows access to a Brick Block containing a Mini Mushroom. A section of ground with a Koopa Troopa and a Goomba on it, with Mega Urchins below, is followed by a Waterspouts. More Mega Urchins on Waterspouts are found, followed by the Checkpoint Flag. A platform containing a long row of Mega Urchins on Waterspouts, and is followed by a platform with a Koopa Troopa on it and a row of Urchins on Waterspouts below. Another section of Mega Urchins on Waterspouts follows. A Waterspout that leads to a platform above is found, along with a Red Ring. More Mega Urchins on Waterspouts follow, with two lifted above rows of Donut Blocks before the Goal Pole.
- Star Coin 1: Underneath an orange bridge, a Mini Mushroom is required to reach the first Star Coin.
- Star Coin 2: Immediately after the first Star Coin is a Waterspouts that reaches up to the Warp Pipe that leads to the area with the second Star Coin. Like before, a Mini Mushroom is required to reach it.
- Star Coin 3: Below an orange bridge is a series of Urchins and Waterspouts that creates a path to the Warp Pipe that leads to the area with the third Star Coin.