From the Super Mario Wiki
Ads keep the MarioWiki independent and free :)
Shish-Kebab Tower, or Sparkling Waters-Tower, is the third course of Sparkling Waters in New Super Luigi U. It is unlocked by completing Urchin Reef Romp, and its own completion will unlock Haunted Cargo Hold.
The player starts in an area with platforms above and below. The player must jump up while avoiding the Skewers. Then, they reach the first lift with two Fire Bros. located below it. If the player stays to the far right, they can obtain the first Star Coin. Then, after reaching the end of the lift ride, the player is in an area where several Skewers come out all at once. The player can obtain the second Star Coin if they work their way up on the right side. Then, the player will hop on a second lift, which takes them past an 8-bit Luigi and to the area before the boss. Skewers, a Fire Bro and the third Star Coin (encased in Brick Blocks) are before the boss door which leads to Boom Boom. After jumping on Boom Boom three times, he will be defeated, and the level Haunted Cargo Hold will be unlocked.
Names in other languages