These hints are more-or-less in chronological order. If you're trying to solve a puzzle without first dealing with the problem addressed BEFORE it in this list, the hint will not work.

Okay... can you start me off here?

What do I do with the green rocks?

The rock's glowing; where to now?

Okay, look, this is cute and all, but I've only seen a couple of dead soldiers and the Yeti keeps moving around. How do I get to him, period?

I'm in the cave with the Yeti, now what?

Okay, he gets stunned, gets mad, pounds the floor and I get whacked by ice pillars! How did THAT help?