Zelda Adventure of Link - Heart Containers
Just like the Magic Containers, you can find an additional four Heart Containers, in which are scattered across Hyrule. Please note, Link initially begins his quest with a total of four heart containers.

The first additional heart container is located in the southern area of the first palace. In the south, a small forest can be easily spotted, however often found misleading. In any case, choose the path that will take Link to a scrolling scene, where Link must avoid bubbles while crossing the pits. Then, continue your journey South thus you will find a 3x3 area with the center piece empty. In any case, the empty space will take you to an abnormal battle scene, in which you will find the Heart Container towards the right of your scene along with a Goriya. P. S. You must defeat the Goriya in order to acquire the Heart Container.

After obtaining the Hammer, smack the rock next to Rauru Town. Then, continue your way east until you find a rock blocking a cave. Once again, smash the rock apart and collect the Heart Container at the end of the cave.

After obtaining the Boots, make your way onto the sea. While you're walking to the midst of the sea, head North four space, then proceed Eastward. Finally, you will encounter a mountain, in which holds the 7th Heart Container.

For your final Heart Container, simply search in the South-East area of the beach of the sixth palace. In brief, finding the last Heart should not be difficult.