Push the left of the two gravestones in the middle up. Walk into the cave and grab the Heart Container.
 From the start screen, head right four screens, up four and left one. Use the Whistle and enter the resulting staircase. Grab the Heart Container.
 From the start screen, head right one screen, up five, left one, up one, cross the river, head up one, then right one. Play the Whistle, enter the staircase and grab the Heart Container.

From the start screen, head up one screen, left five, up one and down on the left side, left one, through the Lost Woods and up four.
Make sure you have the Whistle.
Make sure you have the Whistle.
Follow the instructions from the First Quest for Heart Containers #4 and #5.
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