World 9-2 (New Super Mario Bros. Wii)
From the Super Mario Wiki
World 9-2 is the second level of World 9 in New Super Mario Bros. Wii. It is unlocked by collecting all of the Star Coins from World 2. This course takes place in a beach setting and plays the beach theme from World 4. Like all levels in World 9, there is no midway point.
Mario begins the level near two Koopa Paratroopas and a Piranha Plant in a Warp Pipe, along a Porcupuffer that chases from the water below. Mario can then find a regular Koopa Troopa along with a group of ? Blocks and Brick Blocks. Three Switchbacks that descend when Mario touches them are also found along with a beach area with more Koopa Troopas. Mario can use one of their shells to break Brick Blocks, one of which contains a 1-Up Mushroom. Another Switchback can then be found, along with a Warp Pipe that takes Mario to an underwater area where a Cheep-Chomp can be found guarding the second Star Coin. After the Switchback, vines that can help Mario cross the water are found, along with more Koopa Paratroopas. After the vines, Mario arrives on a platform where a group of four blocks can be found, one of which contains a P Switch that, when pressed, causes Blue Coins to appear. Following the Blue Coins leads to a Hidden Block with a 1-Up Mushroom inside of it. After the group of blocks, Mario can find a group of Koopa Troopas, along with Stretch Blocks. Hidden Coins can be found above some of the Stretch Blocks. After the Stretch Blocks, a group of Koopa Paratroopas can be found, along with the flagpole.