From the Super Mario Wiki
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.
Luigi starts in an area with platforms above and below. Luigi must jump up while avoiding several Skewers. Then, he reaches the first lift, with two Fire Bros. located below it. If Luigi stays to the far right, he can obtain the first Star Coin. Then, after reaching the end of the lift ride, Luigi is in an area where several Skewers come out all at once. Luigi can obtain the second Star Coin if he works his way up on the right side. Then, Luigi will hop on a second lift, which takes him 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.
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