Where is the 3 coin in world 4 level 5?

The first star coin is after the place where you have to blow up the wall with a bob-omb to get through. Keep going to where the place with the blocks that can only be destroyed by a bomb, with the square of breakable blocks. Keep going and stop right before the drawbridge and use a bomb to blow up the wall to the left after ground pounding the blocks to get in. The second one is right after the first one above the drawbridge, where you have to hit one of the blocks with your head while the bomb is on top of it. The third one is three drawbridges after the second one. You jump on a bomb then press and hold Y to hold it, then when the drawbridge is open you jump down it onto the pipe protected by the stone blocks. You then drop the bomb by letting go of Y (Make sure you aren't moving or you'll throw it) and jump away, then when the bomb explodes go down the pipe. You'll then see a room with a strange arrangement of the stone blocks with five bombs. You can't just jump on each bomb then wait, you have to jump on one then see where it explodes, then jump on another one and place it in the place where the first one exploded to make a bigger gap until you get to the center where the third coin is. If it doesn't work, just go through the second pipe then go to the left and try it again. Sorry for the long post.