Can't find 3rd coin in W4-3 - Nintendo New Super Mario Bros. for DS

Star coins can be found through the various levels, usually in hidden areas. Cheating can only be done via a 3rd party cartridge such as an action replay device.

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under the controls for the side view mirrors, behind the coin holder cup. open the coin cup & pull up on the cup until it pops out of place. on the back of the coin cup is the fuse diagram. its the "cig" on the 3rd column, top row, "15a". there are some spare fuses under the hood. open the hood & its on the right of the engine in the black box that's about 10in by 4in big. open the cover & look at the fuse diagram & look for the spares on the top right.

http://www.youtube.com/watch?v=cfOj0bPt6r4 Go here. It is a walkthrough of the whole level.

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you have to spin down slow and hit the turtal and it will dounce you so you can get in the tube. hope it helps you.

go to the final platform that sways up and down right before the warp pipe that takes you to the flag pole. wait until the platform goes up on the right. jump on the rocks on the top of the screen,then dash. then you will see the 3rd coin.

Kill the boomerang man near the end then sink in the quik sand but keep jumping so you dont go to low and go in the metal square its there!!

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New Super Mario DS star coins Q.? - Yahoo!7 Answers

On the 4th spinner thing, you go all the way to left and jump onto the ledge. Scale your way up to the door. When you get into that room, you'll have to keep jumping in the yellow bar lifter in order to get up to the top.