Mickey's Letters

Mickey's Letter refers to the letter addressed to Donald Duck, left behind by King Mickey in Disney Castle, in the beginning of Kingdom Hearts. Usually Mickey's Letter was sealed by a symbol like Mickey's head that color green. In it, he writes the reasons for his sudden disappearance, as well as instructions to Donald and Goofy to find the key-bearer. Though the content is unknown, another letter by Mickey makes two more appearances in the game. It is shown held by Pluto at the end of Kingdom Hearts, which is also the beginning of Kingdom Hearts: Chain of Memories. In Kingdom Hearts II, it makes its appearance as a note in a bottle at the end.

The sequence of King Mickey's (first) letter takes place on the day before the storm strikes Destiny Islands.

Contents
Donald,

Sorry to rush off without sayin' goodbye, but there's big trouble brewin'.

''Not sure why, but the stars have been blinkin' out, one by one. And that means disaster can't be far behind. I hate to leave you all but I've gotta go check into it.''

''There's someone with a "key"-- the key to our survival. So I need you and Goofy to find him, and stick with him. Got it?''

''We need that key or we're doomed! So go to Traverse Town and find Leon. He'll point you in the right direction.''

''P.S. Would ya apologize to Minnie for me? Thanks, pal.''

Signed - Mickey

Manga
The letter reappears in the Manga series of Kingdom Hearts, with some slight differences.

Dear Donald,

Please forgive me for leaving so suddenly, but trouble is brewing, and there's no time to lose.

''I'm not sure why, but the stars have been blinking out... one by one.''

Hate to leave you, but I have to check into this.

As the king, I have a favor to ask you and Goofy...

There is someone out there with a key''-- the key to our survival. I need you and Goofy to find him and stick with him! Got it?''

Without that key, we're doomed!

So go to Traverse Town and find Leon...