Heart Containers and Pieces of Heart
At the start of the game, Link only has three heart containers. As the story progresses, you will gain additional containers to fill your life meter. Another way to gain more containers is to collect Pieces of Heart. For every four pieces you receive, you will have one full heart container. There are twelve pieces of heart scattered around Koholint making a total of fourteen Heart Containers.
Secret Sea Shells
You may find many treasure chests in the dungeons. These can contain rupees, power-increasing items and dungeon items (you can open and take the contents of a treasure chest only once). Some treasure chests are in plain view; others will appear only after you have defeated all the other monsters in a room.