Giant Ring #1 (15)

When you land in the sand, jump up.

Go right and push the yellow block.

Ride the yellow block and go down the slides.

Run down the slope and grab the pulley lift.

Go right and run through the loop de loop.

Push the yellow block and ride it.

Use the swings and go left.

Collect the Invincibility and go up.

When you go past a Starpost (a type of checkpoint (an auto-save point you restart from on death)), head left for a while.

When you see the spikes at the bottom of the waterfall of sand, jump over the swing and proceed past the quicksand.

You'll eventually find a hidden passageway containing the Giant Ring.