Giant Ring #1 (35)

When the pool of lava freezes over, go right and head across it.

Press the switch and go through the opening.

Head across the blue cylinder while avoiding the row of spikes.

Dodge the Robotnik Boxes (enemies created by Dr. Robotnik).

Head right to break open a few boulders.

Go through the orange pipe and jump over the hidden spring.

Break through the boulders and grab a Flame Shield on the platform nearby.

You can bounce on the bottom right spring for an easier time getting the Flame Shield.

Drop down the collapsing ledges and head past the exploding rocks.

When the eastern platform moves left, jump right to continue onward.

Head across the blue cylinder while avoiding the row of spikes, but beware of the overhead spikes.

Bounce on the hidden spring to catapult Knuckles up to a Starpost (a checkpoint (an auto-save point you restart from on death)).

Activate the Starpost and drop down.

Press the switch and go through the opening.

Take out the 2 Toxiomisters (types of Badniks).

Use the spiked platforms to descend.

Watch out for the flamethrower.

Run left to enter a fake wall.

You'll discover a hidden room containing the Giant Ring.