The Legend of Zelda: The Wind Waker/Minigames

Battleship on Windfall Island
At the top plaza of Windfall Island in the building across from Mrs. Marie's school you can play a game similar to battleship. You'll be charged 10 rupees to play. You have 20 bombs to try and blow up 3 ships. There are 3 sizes of ships, one that takes up 2 squares, one that takes up 3 squares and one that takes up 4 squares. If you blow up all three ships you'll be rewarded with a piece of heart.

If you win a second time he'll reward you with a treasure chart. After that you'll win 50 rupees for winning.

If you beat the high score using less than 20 bombs you'll another treasure chart.

Letter Sorting on Dragon Roost Island
On the second floor of the Rito tribe village there is a post office where you can earn rupees sorting letters. Your goal is to match the seal on the envelope with the symbol on the shelf and throw the letter.

In the first round you have 30 seconds to sort 10 letters. You're rewarded with 1 rupee for every 2 letters.

In the second round you have 30 seconds to sort 20 letters. You're rewarded with 1 rupee per letter.

In the third round you have 30 seconds to sort 25 letters. This time if you get more than 25 letters you're rewarded with 3 rupees per letter.

The postman will ask you to come back and give the new guy some pointers. If you leave the area and come back the new guy will be there. He'll ask to see the legendary 25 letter sort. If you sort 25 letters in 30 seconds he'll ask you to put a letter in the postbox for him.