Larry's Trigger-Happy Castle, or Sparkling Waters-Castle, is the Castle level of Sparkling Waters in New Super Luigi U. It is unlocked by completing Dragoneel Depths and its own completion will unlock All Aboard!
Luigi begins the level in front of an area that fire Banzai Bills. Some Brick Blocks and a ? Block are found, followed by two Bill Blaster Turrets. A pit of water with Torpedo Teds in it can be found in between them. Two Brick Blocks, one of which contains a power-up, can be found. A Hidden Block containing a Mini Mushroom is above the Brick Blocks. Luigi can climb up the Brick Blocks to a mini Warp Pipe, leading to a hidden area with coins. A Warp Pipe is found, and it leads to an underwater area. Two groups of Brick Blocks are found along with some Red Skull Box that release Targeting Teds. A Warp Pipe that leads to the next area is then found. A ? Block is found next to a wall made of Brick Blocks. A King Bill then destroys the wall, and Luigi must jump on Brick Blocks floating above the water to avoid it. The boss door is then found. Luigi must fight Larry Koopa, who battles the same way he did in New Super Mario Bros. U.
- Star Coin 1: Jump on the first Bullet Bill cannon and jump to the Star Coin over the gap in between the cannons.
- Star Coin 2: In the underwater part, activate the P Switch and swim to the Star Coin.
- Star Coin 3: After exiting the underwater part of the level, jump on the three platforms and jump to the Star Coin before the King Bill destroys them.
Hidden Luigi image
After going in the underwater section (not in the Mini pipe), hit the Brick Block with a P Switch on it and let a Torpedo Ted hit that block to activate it. After that, swim above the exit pipe as fast as you can to reveal a picture of standard Luigi from Super Mario Bros. swimming.