The Circle of Stones

Hint: How do I get through that gate in the right skull cave?

Hint: Uh, oh. A skeleton!

Hint: What's that button in the hallway do?

Hint: What did that boulder do?

Hint: Geez, another gate. How do I open this one?

Hint: How do I open that big door?

Hint: What's with the casket?

Hint: What do I do with the dragon?

Hint: I'm out of that skull cave! Where do I go?

Nested hint: Another door ... how do I open this one?
(sorry, cannot decode section)