Hammerswing Caverns

Hammerswing Caverns, or Superstar Road-4, is the fourth course of Superstar Road in New Super Mario Bros. U. It is unlocked when the player collects every Star Coin in Frosted Glacier.

Layout
The course is based on the icy caverns in Frosted Glacier. The level begins outside, with a Warp Pipe leading to the icy underground area. Two large icicles fall onto platforms, with a ? Block found above a platform in between. Two hammer-shaped platforms that swing back and forth are found, and one can be used to reach a ? Block above an icy platform. Another large icicle is found next to a small one, along with a group of Koopa Troopas. More swinging platforms are found, and are used to cross above a pit. Another large icicle falls onto a platform, and a Buzzy Beetle can be found nearby. A group of icicles is found above a pit crossed by two swinging platforms. A Buzzy Beetle is found underneath Brick Blocks, followed by a swinging platform on a track. Four icicles and a ? Block are found as the platform moves. A slope with multiple Buzzy Beetles and icicles on it is encountered, followed by a two large icicles. A Green Ring is found before another swinging platform on a track. Two swinging platforms are found before another one on a track, and a P Switch can be used to cause Blue Coins to appear. A Koopa Paratroopa and a Warp Pipe are found. The player is led back outside, with a swinging platform and the Goal Pole are found.

Star Coins

 * Star Coin 1: The first Star Coin is near the beginning of the level. After the player passes the first set of double swinging platforms, there is an alcove slightly transparent. Mario should jump into the hidden alcove in the ceiling.
 * Star Coin 2: The player will need to use the Flying Squirrel suit to glide under a ledge and reach a Warp Pipe that contains the second Star Coin. A P Switch must be pressed to turn the Brick Blocks blocking it into coins.
 * Star Coin 3: The final Star Coin is found at the end of the level. The player can reach the wall beside it with a running start and wall-jump to it. The player can use the Flying Squirrel suit to reach it as well.

Enemies

 * Koopa Troopas
 * Buzzy Beetles
 * Koopa Paratroopas

Names in other languages
Hammerhöhle