Link's Awakening Secret Seashells
There are a total of 26 Secret Seashells found in Link's Awakening. They're found all over the Overworld, and a little in dungeons. When you collect 20, go to the Seashell Mansion near Kanalet Castle to get the L-2 Sword.

Secret Seashell List

 Secret Seashell #1 Mabe Village 
Description:

 - One screen above the Trendy Game you will find an area covered in bushes. Chop down the bush four rows over and four rows up to receive the first seashell.

Required Item(s):

 - Sword

 Secret Seashell #2 Mysterious Forest 
Description:

 - There is an area in the forest which has a chest, guarded by Moblins and Zols and blocked off by a rock. Use the Power Bracelet to move the rock and open the chest to receive a seashell.

Required Item(s):

 - Power Bracelet

 Secret Seashell #3 Mabe Village 
Description:

 - You can get this seashell any time you have 200 rupees to buy the Deluxe Shovel, but by the time you beat Level 2, you should surely have that much or more. After you buy the Deluxe Shovel, dig up the dirt in the bottom-right corner of the doghouse to reveal a buried seashell.

Required Item(s):

 - Deluxe Shovel

 Secret Seashell #4 Tail Cave 
Description:

 - After beating Level 2: Bottle Grotto, the shop in Mabe Village will now carry bombs, which are sold by 10 for 10 rupees. Pick up some bombs and head back to the Tail Cave, and go to the room with the cracked wall. Bomb the wall to gain access to a secret room with a chest containing a seashell.

Required Item(s):

 - Bombs

 Secret Seashell #5 Ukuku Prairie 
Description:

 - Climb the stairs one screen right of the entrance to Level 3: Key Cavern. Go left one screen after this to get to a spot with some patches of grass growing around a square spot of land. Dig this spot up to reveal a buried seashell.

Required Item(s):

 - Deluxe Shovel

 Secret Seashell #6 Seashell Mansion 
Description:

 - Once you no fewer or more than five Secret Seashells, head to the Seashell Mansion in Ukuku Prairie. Once inside, walk through the two bars to receive a seashell.

Required Item(s):

 - No fewer or more than five Secret Seashells (or else you can't get it)

 Secret Seashell #7 Ukuku Prairie 
Description:

 - Located one screen right of the Seashell Mansion is an area with some bushes. Chop down the two on the top, where the second will reveal the hidden seashell.

Required Item(s):

 - Sword

 Secret Seashell #8 Richardís Villa 
Description:

 - After retrieving the five Golden Leaves from Kanalet Castle for Richard, he will allow you to take a set of stairs beneath a block in his home to Pothole Field. After going down the stairs, take the left path. Push the boulder into the pit and jump across to gain access to the chest, where a seashell is hidden.

Required Item(s):

 - Five Golden Leaves from Kanalet Castle, Rocís Feather

 Secret Seashell #9 Ukuku Prairie 
Description:

 - Travel south towards the Cemetery to Ukuku Prairie and you will notice a rock blocking a staircase. Move the rock with the Power Bracelet, and head down one screen. Cut down the bush there and dig in its place to recover a seashell.

Required Item(s):

 - Power Bracelet, Sword, Shovel

 Secret Seashell #10 Ukuku Prairie 
Description:

 - Right after leaving Mabe Village to the east (where you cut through the bushes and move the rock), head down one screen. There is a Telephone Booth and a tree here. Ram the tree with the Pegasus Boots equipped to reveal a hidden seashell.

Required Item(s):

 - Pegasus Boots

 Secret Seashell #11 Seashell Mansion 
Description:

 - Just like when you received your 6th seashell for having no fewer or more than five, you will receive an 11th for getting ten as well. Go back to the Seashell Mansion and walk between the bars to receive the seashell.

Required Item(s):

 - No fewer or more than ten Secret Seashells (or else you can't get it)

 Secret Seashell #12 South of the Village 
Description:

 - Head south of Mabe Village and take the same route you did when going to Level 1: Tail Cave. Right before you come to the screen with the entrance to Tail Cave, there is an area with a lone tree. Charge into its left side with the Pegasus Boots to reveal a hidden seashell.

Required Item(s):

 - Pegasus Boots

 Secret Seashell #13 Martha's Bay 
Description:

 - There is a small bush near the southwestern corner of Martha's Bay. Chop down the bush there to reveal a hidden seashell.

Required Item(s):

 - Sword

 Secret Seashell #14 Ukuku Prairie 
Description:

 - Just left and south one screen each from the area with a small rock maze is, you will notice a cave. Enter it, go right one screen, and bomb the indention in the western wall. Enter the hole and jump across the pit to get to the staircase. You will come out of the cave above the one you originally entered. Go up one screen and dig the ground one step down and one left of the Owl Statue to reveal a buried seashell.

Required Item(s):

 - Bombs, Rocís Feather, Shovel

 Secret Seashell #15 Ukuku Prairie 
Description:

 - In the area with Moblins and donut-shaped stones, you will notice an out of place rock. Lift it up with your Power Bracelet to reveal a hidden seashell.

Required Item(s):

 - Power Bracelet

 Secret Seashell #16 Yarna Desert 
Description:

 - After defeating Lanmola in the desert, drop down into the quicksand and head right one screen to exit the cave. Go south and stay on the right side of the two bottom cacti. Continue following the path on the far right until you reach a spot with two bushes and a couple of boulders. The seashell is underneath the bottom boulder.

Required Item(s):

 - Power Bracelet

 Secret Seashell #17 House by the Bay 
Description:

 - After helping the ghost by taking him to his house, then back to his grave, he will tell you to look under a pot inside of his house. Only after helping the ghost will the seashell be there. It is located under the pot in the bottom-right section of the house.

Required Item(s):

 - Power Bracelet

 Secret Seashell #18 Marthaís Bay 
Description:

 -Go near the House by the Bay. Head west. You will see an island with a bush. Swim over to the island and chop down the bush to retrieve the seashell.

Required Item(s):

 - Flippers, Sword

 Secret Seashell #19 Ukuku Prairie 
Description:

 - Go near the lake that surrounds Key Cavern. Swim to the small patch of land with the bush on it. Chop down the bush to reveal a seashell. However, you must chop it from the north part, or else it will bounce into the water, requiring you to leave and re-enter the screen to get it.

Required Item(s):

 - Sword, Flippers

 Secret Seashell #20 Martha's Bay 
Description:

 - Travel two screens south of the entrance to Animal Village, and one screen left afterwards. Then, go up one screen across the bridge. You will see an owl statue there. Dig the ground to the left of the statue to unearth a seashell.

Required Item(s):

 - Deluxe Shovel

 Secret Seashell #21 Southern Shrine 
Description:

 - Go to the Southern Shrine north of Animal Village. On the northern center part, there is a staircase below the Armos in the lower-right corner. Make it move by touching it, kill it, or both to make it move away from the staircase. Go down the stairs and open the chest for a seashell.

Required Item(s):

 - None

 Secret Seashell #22 Raft Ride Area 
Description:

 - You will need to Hook Shot to even get to the Face Shrine, and in order to get that item you will need to have completed Level 5: Catfishís Maw. After you get to the Face Shrine, progress until you reach the top-left corner of the dungeon, which will be a room with a staircase and a chest containing 100 rupees. Walk up the steps and open the chest to get the rupees (if you havenít already) and continue up the staircase. You will come out in the Raft Ride area on a small piece of land with a chest. Open it to receive a seashell.

Required Item(s):

 - Hook Shot, L-2 Power Bracelet

 Secret Seashell #23 Kanalet Castle 
Description:

 -Late in your quest you will have to revive a legendary rooster under the statue in Mabe Village. Once you do, head to Kanalet Castle. Fly west from the gate across the pits. Go down the stairs and open the chest for a seashell.

Required Item(s):

 - Ocarina, Power Bracelet, Flying Rooster

 Secret Seashell #24 Tal Tal Heights 
Description:

 - Near the top of Tal Tal Heights, you will find a house, also known as the Hen House. Go east from it and lift up the rock in the corner to find a seashell.

Required Item(s):

 - Power Bracelet, Flippers, Rocís Feather

 Secret Seashell #25 Tal Tal Heights 
Description:

 - In one cave in Tal Tal Heights, there is shallow water and a small patch of land sticking out from the wall. Go in and go up the stairs and follow the path. Move the boulders while grabbing the treasure chests for money and go outside. Open the chest to receive a seashell.

Required Item(s):

 - Flippers, Bombs

 Secret Seashell #26 Eagle's Tower 
Description:

 - From the start, go left one screen, then up one. If the blocks are in the way of the staircase, locate a switch to change them out. Go up the staircase and continue down one screen. Jump in the top-left pit in this room and you will land on the walkway next to the wall on the floor below. Go up two screens from here on the walkway and you will come to a chest. Open it to receive the seashell.

Required Item(s):

 - None

 The Prize Seashell Mansion 
Description:

 - After finally getting 20, go to the Seashell Mansion. A message will say its work is done, and after a short scene, the L-2 Sword will drop before you. Pick it up, and a cut scene very similar to the one where you got your Sword on Toronbo Shores will come in place. Congratulations!

Required Item(s):

 - 20 Secret Seashells