Big G Movie Codes

[GuyIncognito]

I have a few codes from General Mills cereal. I can't get any of them to work for redeeming a movie. It says "one or both codes is invalid" but I never know which code they are saying is wrong. I've tried changing a couple characters in case I misinterpreted what was printed on the box. Is there a guide that says what their characters actually are?

And while I'm on the subject, why the hell do they print stupid looking characters for these things? Why not make it clearly legible? I hate dot-matrix, block letters where you have no idea if it's a D, O or 0. Or you don't know if it's an 8 or a B.