Entrance: Go north. Defeat the Stalfos. Go north again.
Compass Room: Defeat the two Keese. A chest appears with the Compass. Go west.
Key & Map Room: Push the bottom-right block right. A chest appears with a Small Key. Go up the stairs, cross the ledge, and open the chest for the Dungeon Map. Go back down and east to the Compass Room. Go north through the door.
Button & Key: Hit the switch to make the rollers retract. Quickly run past them. Step on the button. Grab the Small Key from the chest. Go west.
Locked Door 1: Defeat the Gels. Use a Small Key on the locked door. Go north.
Mine Cart: Hop in the mine cart. It takes you to another room. Go east.
Seed Satchel: Push the single block up to reveal stairs. Go down. Navigate the side-scrolling area (jump the gaps). Climb the ladder. Open the chest to get the Seed Satchel containing Ember Seeds!
Using Ember Seeds: Go back down the stairs. Go west to the mine cart room. Go south. Light the two torches with Ember Seeds. The door opens. Go east.
Locked Door 2: Defeat the Floormaster (the hand). Use a Small Key on the locked door. Go north.
Miniboss Room: Defeat the two Goriya Bros. (Throw their boomerangs back at them or just hit them with your sword). A warp point back to the entrance and a fairy appear. Go east.
Boss Key Room: Defeat the Stalfos. Push the upper block left and the lower block down to reach the chest. Get the Boss Key. Go west, then north through the locked boss door.
Boss: Aquamentus: This dragon shoots fireballs (three at a time) and charges. Avoid the attacks and hit its horn with your sword repeatedly. Ember Seeds also work well.
Reward: Grab the Heart Container. Go east and take the Essence of Nature – Fertile Soil.