New idea...maybe

[azuhlLt.]

I've checked the site and seen the Codebreaker thing, I was working on it before I searched and thought I'd better check if it had been submitted...it has, so I can just expand on the original idea.

Code 1 is obviously alphanumeric

Code 2 uses the IPA (International Phonetic Alphabet)

Code 3 uses spaces (e.g.: Hel lom yn a mei saz u hl - Hello my name is azuhl)

Code 4 uses the Ceasar cypher (Move the alphabet 3 letters to the right. E.g. : A=X, B=Y, C=Z, D=A, E=B...)

It's easy stuff and I think you can provide them with a hint sheet if necessary.

Code 1 – 何番目のアルファベット (nan ban me no alphabet)

Code 2 – 表音字母 (hyouon jibo)

Code 3 – 間 (aida)

Code 4 – 三右 (San migi)

...and the like.

EDIT: Because edit.