I have to be honest, I have played the Harry Potter jumble quite a few times!
AFB also makes a book, The Braille Trail, which I love to use when I am teaching about Braille. It's got fun activities and explains Braille easily.
Here's the link: http://www.afb.org/braillebug/
Have some fun and check it out! It's a great family site or classroom project site.
Do it at home: Check out the site! Play some of the games. You can change the colors of the site, write your name in Braille, learn about Louis Braille and read a special section just for teachers and parents. Have fun!!