Pen Pals

Free

Slow letters. They take half a day to a few days to arrive, depending on how far they travel, and each fades a day after it's opened.

Open Pen Pals in RippleWatch the doodle move

In the drawing

Quillby flies across the page clutching a letter with a red seal, heading for a blue mailbox with a padlock on it. The little red flag flips up.