There are 36 Heart pieces to collect in Ocarina Of Time. For every four you collect, another heart is added to your health meter, so its worth getting every last one!
Where: Big Vase
How to get it: First, get the vase on the lowest floor spinning by lighting all of the lanterns on the floor with Deku Sticks. When it starts spinning, go a floor or two up, and through bombs into it. Each bomb that goes into the vase gives you an item. Keep doing this until it gives you a Heart Piece.
How to get it: At night, find a house in the backalleys with a fat woman inside. Talk to her and she’ll ask you to find her lost dog. To get dogs to follow you, run into them a couple of times. Her dog is white, so take a white one back to see her. If it isn’t the one, go back and find another white dog.
Where: Entrance To Lake Hylia
How to get it: Go in between the two fences at the entrance of Lake Hylia, so that you have one either side of you. Place a bomb there and run out of the blast radius. A hole will open up in the ground, so drop down into it. Buy the heart piece off a Business Scrub down there for 10 rupees.
Where: The Graveyard
How to get it: This time, go up to a grave in the second row with flowers at its base during the day. Pull it back from behind, and drop down the hole it reveals. Go down the hole and kill the ReDeads. Once that is all done, play the Sun Song, and another Heart Piece is yours!
Where: Anju’s House
How to get it: Ask the Owl at the top of Death Mountain for a lift back down to Kakariko Village. Let go as you pass over Anju’s House, so that you land on that brown cover. Go inside the house from here, and take the Heart Piece.
Where: Strange Isolated Building
How to get it: Run around the edge of the Lon Lon Ranch field, between the fence to Hyrule field and the fence to keep the horses in. You should come to a building on its own. Enter it, and solve the little crate puzzle. Through the hole in the wall is a Heart Piece.
Where: With Skullkid
How to get it: Go left as soon as you enter the Lost Woods, and you’ll be in a room with a Skullkid. Jump on the tree stump near him and play Saria’s Song to him for a Heart Piece.
Where: Behind The Waterfall
How to get it: Go behind the waterfall you dive off to play the diving game, and use Din’s Fire to light both torches there. Take out a Deku Stick and light it on the torch on the right. Run over the shallow part of the small lake, lighting three torches as you make your way to outside the Zora shop. A chest will appear behind the waterfall you started in if you were fast enough, with a Heart Piece inside.
Where: The Musical Frogs
How to get it: On your way to the top of the river, you’ll come across a log that is half in the water and half on dry land. Walk down it ‘till the end and Navi will tell you that some frogs are staring at you. Get out your Ocarina and play the Song Of Storms for them, in return for a Heart Piece.
Where: The Musical Frogs Again
How to get it: Go back to the frogs and take out your Ocarina again. Play every song that doesn’t warp you to them, and they’ll let you play the bug catching game. When a fly flies over them, press the note that corresponds to that frog. If you win the game you’ll get a Heart Piece.
Where: Entrance To Dodongo’s Cavern
How to get it: There’s a small patch of soft soil outside the entrance, so as a child plant a seed there and then come back as an adult. Ride the plant up to get another Heart Piece.
Where: Behind The Waterfall
How to get it: Glide down to the ledge right next to the waterfall with a Cucco, and then jump behind the waterfall, climbing up the ladder you find back there. At the top is an alcove with a Heart Piece inside.
Where: Outside the Market Walls
How to get it: Face the castle drawbridge, and then follow the Market wall round to your left. When you come to some trees, place a bomb under the one tree that is further away from the others. Go down the hole and put on your iron boots. Descend to the bottom of the water in the hole and your heart piece is down there.
Where: The Top Of The Lookout Tower
How to get it: During the day, use the ladder to get to the top of the Lookout Tower. Use your Hookshot to grapple onto the roof with a man resting there. Talk to him and he’ll give you a Heart Piece.
Where: A Ledge Further Up
How to get it: As you go further up the river, you’ll see another ledge with a Heart Piece on it. Use your Hover Boots or a chicken to float over to it, but to get near it this time you’ll need to use a ladder to climb up to a nearby platform.