Go north of the village heading directly north, eventually going east, up, and west. Use the key to enter the Dungeon. Go up one screen to what will be known as the Main Room. Push the top-right block up to open the doors. Go up to meet a strange old man, "Return light to unlit torches!" A little nostalgic I believe.

Go back to the Main Room and go right. Kill the four Stalfos for a Small Key. Return to the Main Room and go left, using your new key. Kill the four Stalfos for thechest with the Dungeon Map to appear. Go north. Kill the gels and jump in the mine cart (the blue thing to the north). It steers itself into a room with two Moblins. Kill them too, so predictable. Push the block in between the moving blades to open the door. Go left.

I can't exactly describe how to push the blocks, so you'll have to figure it out on your own (util I get a diagram up). Go up the stairs and get a Gasha Seed. Go back to the room with the Moblins and up the stairs. Throw the switch by hitting it with your sword. Go right to get the Compass out of the chest.

Now, return to the Mine Cart and ride it to the end. Once you're off go left for the chest for Ten Bombs. I feel the desire to blow something up...

First go all the way to the right in the room and step on the switch to make the chest with a Small Key appear.

Go up the stairs and to the left... oh, what's this? A crack. I think you know what to do. Bomb the sucker and enter the room. Be careful when venturing up cause a blade comes at you! Move down and follow to the nook in the blocks. Move up to make it run and retreat, and run behind it to proceed upward. Make your way all the top of the room, where the locked door is. Thankfully a fairy is hidden in a bush right near the door, so heal up and face the... mini bosses.

Go left and go around the diamond, dodging the blades, and push the left most block up and go down the stairs (this is getting too Zelda 1-ee for me). Get the Seed Satchel and use the warp where the Mini Bosses used to be. Use the Ember Seeds to light the unlit boxes and go through the door. Kill the three Moblins for a chest with the Boss Key to appear.

Now, go down, and right twice (passing the Main Room) and light the boxes in the there to open that door. Go through the door.

Stay calm, Floormasters are in this room. For the newbies, Floormasters grab you take you back to the entrance of the level. Go right, up, right (using the upper right path), and right again to the Boss Door. Now prepare to face Aquamentus!

For the love of Din, what is with the Zelda 1 references? I feel so nostalgic. Slash the head, slash the head! After X amounts of hits, Aquamentus will die, bequeathing the Heart Container and the Fertile Soil.