New super Mario DS:Where is the third coin in the second fortress in world 8?

Question

No, the other one, the one with lava and the moving plataforms and the swithces thaqt change plataformes

Answer 1

Head right to get onto the green block platform to begin moving, raiding the
? Block for a Power-Up before facing a series of moves through some
Firebars. When Mario enters the narrow hall with spikes and small Firebars,
ride at the front of the platform, riding the blocks upward to grab the
first Star Coin from a small alcove.

get onto the front block immediately to ride upwards, passing the halfway
marker, continuing to the right to ride through the various dips and doodles
of the platform, ignoring the Red Coin Ring while doing so. When you reach
the ? Block holding the Power-Up, take a running leap off the green blocks
to the right to get the second Star Coin, followed by hustling to the right
to get onto the rising green blocks before the Spiked Ball comes crashing
into the scene.

Continue the great green block tour, avoiding the first Spiked Ball to find
a second to leap over and onto the ledge it came from, getting the third
Star Coin before returning to the green blocks. Now get onto the front
block and ride it upwards, leaping over to the right to enter the large red
doors to face Baby Bowser once more!

Baby Bowser will be doing his now familiar hide in his shell before tossing
a Green Koopa shell, so stomp the shell and throw it back to stun him,
followed by planting a plumber boot in his exposed mid section. Repeat the
pattern two more times while watching out for the Podoboo attacks on the
sides, and baby Bowser will make one last run for it!