Where is the 3rd gold coin on the second level in world 1

here is the complete run through for world 2-2
This level will reintroduce everyone to that rapscallion in the flying cloud
(Lakitu) and his pets he throws about (Spiny)! Take on the three Red Koopa
Troopas if you wish to, but mainly concentrate on getting the Power-Up while
moving right, passing the ledge to see Lakitu come out from behind the
nearby Pyramid! Lakitu will throw his pet Spinies at Mario, but if Mario
can take out Lakitu, he will not return for a short while, and Mario may be
able to even hitch a ride in that cloud! Run right to find a couple high ?
Blocks (one has a Power-Up) to attack Lakitu from, and if Firepower is
yours, use it to take Lakitu from his perch, followed by stealing his ride!

With the cloud in hand, fly right until a coin path upwards appear, so
follow it to locate the first Star Coin. Jump off the cloud and run right
past more Red Koopa Troopas, jumping a gap when the Piranha Plant retreats
into his pipe, finding some bricks to Ground Pound through to grab the
second Star Coin. Lakitu should have returned by now, so be wary of him as
you move to the right, finding a structure with bricks and ? Blocks in it
(note that this a tribute to a structure in the first Lakitu level ever, in
SMB's 4-1) to bust up as you desire, followed by locating a green pipe to go
down, which will launch Mario high into the air, directly at a pipe above
(press UP to go inside).

Use the dual set of green pipes here tog et the Coins and third Star Coin,
then head down the pipe on the right to return to the main level area. Move
to the right, suing the rocking toadstool to go jump onto the flagpole,
ending the level!
hope this helps........any more ????
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When you get to the part when there is a random moving platform moving back and forth below a block, there will be a flying block that will lead you to a pipe with the star coin. you have to stand on the flying block but be quick because it will fly away

hi liz , that is a tuffy , i tried hundreds of times , your spossed to be able to jump the dry bones , then get a running start and jump to the right wall , then wall jump back to the upper part of the left wall then to the right and back to the left where you will be at the warp pipe that leads to the 3rd coin , how ever i have not been able to accomplish that in 200 tries , so i got a mini mario in my circle to use when i get there , get to that last door area and mini will do the wall jump just fine , go up the warp pipe and hold on , 4 spiked bars from all directions , dont panic , wait for the cycle , jump to the 1st landing ,then up 1 more to the right and back to the coin , stop at as far left as you can when you get the coin and duck , wait for the next cycle then return the way you got up there and go back down the warp pipe , go back down to the door that dry bones is guarding , enter the door , now you have to stomp bowser jr 3 times as a mini , its tuff but not as hard as wall jumping .

here is a great walk thru link that helped me complete the game 3 times .

http://guides.ign.com/guides/682879/page_21.html

the link i set at world 6 so scroll down to tower level , and see good pics of what to do .
good luck with the game , as hard as some levels are don't give up .
the best tip i could give is to go back to world 1-1 after each level complete and get 2 flowers and extra 1 ups before going into your next level so you are prepared .

J5

super mario ds. on world 4 level 5, how do you get the third coin

to get the last coin on world 6 look everywhere make a high jump to get it

When you get on the board that goes around in circles, wait till the gold question mark flies by. Jump on it and wait till it gets to the wall. Now can you help me find the last coin in the last level of world 6 and how to get the last coin on world 7?

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.

After you get the second coin you need to walk across the ropes to continue. From the second rope, you can bounce up into a hidden pipe to get the third coin. Check out some more info here.

http://www.gamefaqs.com/portable/ds/file/920787/42863

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!!

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