Dodongo's Cavern

Age	Child (story); can also be entered as an adult
Entry	Blow up the boulders blocking the entrance on Death Mountain Trail – as a child, use a Bomb Flower after getting the Goron's Bracelet from Darunia
Dungeon item	Bomb Bag (Bomb Bag chest)
Small keys	None
Mini-boss	Lizalfos
Boss	King Dodongo
Reward	Goron's Ruby and a Heart Container
Gold Skulltulas	5

The cavern is full of Bomb Flowers. With the Goron's Bracelet you can pick them up and throw them at cracked walls and boulders, or let them explode in place to set off chains.
Explore the large central hall and the rooms around it, lighting torches and blowing open walls to reach the upper level.
On the upper level you fight Lizalfos. Defeat them to continue toward the bridge area.
The Bomb Bag chest is reached across the upper bridges. Once you have it, you can carry your own bombs.
Back in the main hall, drop bombs into the eye sockets of the giant Dodongo skull from the bridge above. Once both eyes are blown up, its mouth opens and leads on toward the boss.

King Dodongo inhales before breathing fire. While his mouth is open, throw a bomb (or a Bomb Flower) into it.
The bomb explodes inside him and he collapses. Run up and slash him while he is down.
Afterwards he curls up and rolls around the arena. Get out of his path and keep a bomb ready for his next inhale.

Baby Dodongos explode after they are defeated – step away from them.
If you run low on bombs, Bomb Flowers grow back and some Deku Scrubs in the cavern sell useful items.
Not all five Gold Skulltulas are reachable on the first visit: one needs the Boomerang or Hookshot, another Pierre the Scarecrow or the Longshot.