New Super Mario Bros. U: Rock-Candy Mines-6 -- Thrilling Spine Coaster

This level is pretty dark, but there are some sources of light. Ignore the mini pipe at the beginning because being Mini Mario will put you at a disadvantage. Carefully go to the right to find the bone coaster. The bone coaster travels over purple water. The first Star Coin is over the bone coaster. The bone coaster has headlights that will briefly shine on it. It's after the second dive. Soon after is a Red Coin Ring. The bone coaster won't go into the water until the 8th Red Coin. The P-Switch makes blocks below the coaster so you can reach the coins below. Be quick to return to the coaster. At the top of that hill is an item block with a Starman, which lights up everything. The coaster will then dive into the water a few times. You will then go into a tunnel with Spike Tops on the ceiling. The coaster will speed up. As soon as you get out of the tunnel with the Spike Tops, jump for the second Star Coin. The coaster will dive four times then drops at the pipe at the end. If you still have the Starman, hit the item block in front of the pipe immediately to get another Starman. Go through the pipe and quickly run and drop down to the Nippers below. The third Star Coin is above them. Run back before the power runs out. Go to the right on the rocks above the Nippers for the flagpole. This opens the path to the Fort.