Link's Awakening: Angler Tunnel

The keyhole is at the bottom of the waterfall of Tal Tal Heights. Unlock it before you go up the mountain as it drains the water, allowing you to get to the entrance. Go 1 LEFT, 1 DOWN, 1 LEFT, 1 UP, 2 LEFT, 1 UP. There are three stones blocking the entrance to a cave. Use the bracelet to lift them and go inside. Go right through the cave, slash crystals and push blocks to get to the stairwell. Go up it then continue right and go up more stairs. Go right and use the boots to destroy the weird objects. Go out the door furthest to the right. Once outside go right and walk through the shallow water. Keep going right until you see the gap on the ledge. Fall down and you will be at the entrance.

FROM START
RIGHT 3: (top of screen) Open the chest for a stone beak.
LEFT 1, UP 1, RIGHT 1, UP 1: Open the chest for the map.
DOWN 1: Use boots and feather to jump gap.
RIGHT 1: Spark, Peahat, Octupus: Lay a bomb on the cracked block to destroy it. Push the other block in the water and open the chest for a key.
UP 1: 2 Octupi, 2 Peahats
UP 1: 2 Sparks, Octupus: Lay a bomb on the cracked block to destroy it. Open chest for a key.
DOWN 2, 2 LEFT, 2 DOWN, 1 LEFT: Red Blob, 2 Spineys: Kill all to open the door on the right.
RIGHT 1: 2 Spineys, Spark, Red Blob: Kill all to open doors. Open the chest for the compass.
DOWN 1: 4 Octupi: Destroy all enemies to open the door. Slash the crystals and open the chest for a key.
UP 1: Unlock the door on the right.
RIGHT 1: 3 Octupi: Unlock door at the top of the screen.
UP 1: 3 Octupi, Peahat.
UP 1: 2 Red Blobs: Use feather and boots together to jump the gap.
UP 1: Ninji, Red Blob, Stalfos, Green Blob: Unlock the block. Push another block up to get through.
LEFT 1: 2 Red Blobs: Kill all baddies for a key which will fall down into the hole. (You can't get it until you have the flippers.)
DOWN 1: 2 Spineys, Green Blob: Read the owl statue.
DOWN 1: 2 Octupi, Peahat: Wait for the peahat to fly out the way, then jump the water with the feather.
LEFT 1: (bottom of screen) 3 Octupi
LEFT 1: 3 Peahats: Wait for them to fly out the way to get through.
UP 1: 2 Stalfos, Red Blob: The chest has a green blob in it.
UP 1: 3 Octupi.
RIGHT 1: Spark, 2 Green Blobs: Open the chest for a key.
LEFT 1, DOWN 2, RIGHT 2, UP 2: Unlock door at the top.
UP 1: BIG BADDIE: As he turns a corner, hit his rear end. Repeat until he is dead and get a halfway marker.
UP 1: Spark: Use the bracelet to pull the lever as far as it will go and then quickly run through the left door before the blocks close up.
LEFT 1: 2 Red Blobs, Green Blob: Kill all to open the doors. Open the chest for the Flippers.
DOWN 1: 2 Shieldbugs, Red Blob: Step on the spots where the spark is. Rememeber which sequence they go in: Bottom-left, Bottom-right, Top-left, Top-right, Centre. Completeing the sequence opens the door again.
DOWN 1, RIGHT 2: Go down the stairwell. Go left and jump in the water to get the key. Go back up the stairwell.
LEFT 3: Step on the spots in the same sequence as before, a stairwell will appear. Go down it. Use the boots to dash past the thwomps. Use the feather to jump on the second thwomp to lift you onto the upper platform.
DOWN 1: Open the chest for the nightmare key.
UP 1: Drop off the ledge.
RIGHT 1: Swim up to the switch and press it to open the door.
UP 1: Unlock the block and go down the stairwell. Swim left through the cavern, killing the fish with your sword. Go up the stairs at the other end.
LEFT 1: 3 Red Blobs: Push the block out of the way. Go up through the nightmare door.
UP 1: Go down the steps, and drop in the water, go down a screen to meet the boss.