zelda viii: oracle of ages
walkthrough - rolling ridge and moblin's keep

Return to the Time Portal next to Naryu's house and go to the past. From there, go up and left. Use the Hook to get to the other side and enter the cave. There you'll find some Gorons trying to destroy a wall, but they need the Bomb Flower to do so. So, exit the cave and use the Song of Currents to get to the present and return to the inside of the cave.

Once in the cave, go left, up, right, and up the stairs. Upstairs, go up, left twice and go up the next set of stairs. Now go up from there and up another set of stairs. Bomb to wall next to the Goron for a Piece of Heart that's inside. Go back to the last room and down to exit the cave.

Welcome to Rolling Ridge. From outside, go right three times where you'll find a singular rock. Lift the rock for a time warp spot and use it with the harp to go back to the past. From here, go left three times and up twice. There you'll find the tree with Pegasus Seeds. Grab a few and then use the Song of Currents to return to the present.

From there, go down, right, and up to find Moblin's Keep. Go inside.

Now that you're inside the Keep, equip the Pegasus Seed and beat feat to the staircase and go up. In the next room, go up where you'll find the Great Moblin. Basically, throw back his bombs at him using the Power Bracelet and after a few hits he'll flee, leaving you with the Bomb Flower!

Head back to the cave with the Gorons in the Past and go inside it. Talk to the Gorons and they'll take the Bomb Flower and blow open the wall. Inside is the Goron Elder, who will reward you with the Crown Key, the key to the next dungeon.

Go up past the Goron Elder and up the stairs to return to Rolling Ridge and go right and up. Here play the Song of Currents to return to the present. Now, go into the cave which once house Moblin's Keep, with the Great Moblin being thankfully long gone.

Inside the cave, do long jumps with the Pegasus Seeds and Roc's Feather to get to the right side of the room and exit the cave. From here, use the seeds and feather again to get to the bottom right of the room and exit the cave.

Here you'll find Crown Dungeon. Use the Crown Key and go inside.