Paper Mario/Letters

Mario's friend Parakarry (a Paratroopa) is supposed to be a Mail Deliverer, but he's not doing a very good job. In fact, he's dropped letters all over Mushroom Kingdom! Mario ends up having to help find the letters and deliver them.

There are 26 letters total in the game. 12 letters are found on throughout the world; 1 of them starting a chain of letters that results in getting the Lucky Day Badge, which is like a better version of the Pretty Lucky Badge. The chain consists of 14 letters. As a reward, for each found 'lost' letter, you will get a star piece. Here are the locations and recipients of the 11 normal letters:

Chain letters
The first chain letter, Letter A, can be found at the farthest right region of Mt. Rugged towards the bottom.