This is an easy Cave Challenge that I made a while ago, that I'm finally putting to decent use.
The first thing you encounter in the cave. I bolded the spots to make it easy to see, but in the real challenge I wouldn't do that.

A pitfall into lava.

A view from the bottom of the cavern

Looking down from the top of the cavern

A cavern filled with lava with stones to hop across. Some stones break after touched for a second.

The slide

The end?

I realize this is spammy. I think this was made before cubes.. and before I really gained building experience. Constructive criticism appreciated. Rate x/10, but realize this isn't near my best work.