Prickly Goombas!, or Frosted Glacier-3, is the third level of Frosted Glacier in New Super Mario Bros. U. It is unlocked via completion of Freezing Rain Tower, and its own completion opens the path to Scaling the Mountainside and Icicle Caverns, both of which are sometimes blocked by a Cooligan enemy course. This level is where Nabbit appears again.
The player begins the level on a ground entirely out of ice, nearby two Venus Fire Traps in Warp Pipes. A ? Block is found above a regular Piranha Plant, containing a Super Mushroom or a Fire Flower, depending on the player's form. Another Piranha Plant is found, along with a Prickly Goomba found next to a Venus Fire Trap. Some rolling hills, Prickly Goombas, and Venus Fire Traps are found. A Venus Fire Trap is found in a Warp Pipe, followed by a ledge with a Prickly Goomba and three regular Goombas on it. The Checkpoint Flag is found, along with another ? Block. A rolling hill with a Goomba on is found, and a ? Block containing a Yoshi Egg is hidden behind a wall at the end of the hill. A Fire Bro is found, followed by a rolling hill with Prickly Goombas on it. Mario then arrives at a ? Block and a Venus Fire Trap. A group of Prickly Goombas is found below a platform, with a Fire Bro burning their shells open. Another Prickly Goomba is found with a Fire Bro, followed by a rolling hill and a row of Piranha Plants in Warp Pipes. A group of rolling hills, Venus Fire Traps, and regular Piranha Plants are found, with the Goal Pole at the end of the area.
- Star Coin 1: The first Star Coin is located through a Warp Pipe above a platform. Some Goombas and a Prickly Goomba are located on the platform, and must be defeated in order to access the Warp Pipe.
- Star Coin 2: After the Midway Point, there is a pipe reachable only by a hidden Yoshi that is hidden in a wall. Through the Warp Pipe, a row of Prickly Goombas must be jumped on using Yoshi in order to reach the second Star Coin.
- Star Coin 3: The third Star Coin is the air after the second Star Coin, above a Fire Bro and a row of Prickly Goombas.