World 7-6

Coin 1

The first Star Coin can be grabbed either by repeatedly jumping on the back of the second small para-beetle just beyond it (as soon as it appears on screen), or by riding the first large one past it all the way down to it. Alternatively, this is pretty easy to grab if you have the Propeller Suit.

Coin 2

You'll find the second Star Coin in the clouds near a platform, just above a long row of small Para-Beetles (the timer will be at about 310 by this point). Hop onto one as it intersects the line of coins leading up to the Star Coin.

Coin 3

The final Star Coin is hidden behind some clouds at the bottom of the screen--you'll know it's coming up when you see the 'staircase' of large beetles. You'll have to ride one of them down onto it, but the tricky bit is getting away safely! This is easy to do if you have either the Propeller Hat or Yoshi. Barring those, if you're playing multiplayer, simply have whoever grabbed it 'bubble up' afterward to float to safety.