Sixteen in all: ten for completing the story and the following six hidden away…
1) Masked Beedle Ship - appears on a weekday between 10pm and midnight, and between 10am and noonon the weekend. He’ll sell you a heart container for 1,500 rupees.
2) Go to the traveler’s ship in the NW sea quadrant and hit the wannabe-Link 100 times in his training game to win a container.
3) Complete the fishing quest outlined in the previous section.
4) Play the archery game in Romanos’s hut on Molida Island and score over 2,000 points to win a container.
5) After finishing the Goron Temple, buy a Bombchu bag from any shop on the island. On your next visit its slot will be occupied by a heart container with a 2,000 rupee price tag.
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6) Travel to Maze Island and beat the maze challenge on Expert for the final container. On floor 3F, bomb the north wall just before the boss door.