New Super Mario Bros. U: Soda Jungle-6 -- Seesaw Bridge

This can be a tricky level. The bridges tilt or rotate, which makes platforming difficult. Making things worse is the purple water below. There's a Wiggler on top of some blocks, which you'll jump from to reach the first tilting bridge. Under the ledge with the red Koopa, hop up and go left for a hidden pipe. The first Star Coin is under the platform under the pipe, over three rotating bridges. Easiest way to get it is to use an Acorn Mushroom. Cling to a wall, then glide to the Star Coin, then boost to safety. The second Star Coin is over the purple water, between two rotating bridges. Use a shell or fly to get it. Ahead are lots of Piranhas in the water. After that are Red Coins and the midpoint. After a random item block is a large rotating bridge. You'll use it to reach a high ledge, but when you can reach it, the bridge will be at a steep angle. Next, you'll see a set of three green pipes. Go through the third pipe. The third Star Coin is near the pipe you just came through, but there are several invisible blocks between the Star Coin and you. You don't need to hit all of them, but make a manageable path for yourself. There's a gap in the invisible blocks next to the left pipe, so jump up through there, then run or jump to get the Star Coin. Go through the pipe on the left to return to the main level. Next are a set of complicated bridges that arc around and have parts that rotate. Time your jumps to avoid going in the water and make your way to solid ground near the flag. This opens the path to the castle.