I got it and got the accidentally free DLCs too ^_^
I've already finished it on normal, which DON'T unlock Bronze difficulty (only Hard unlocks it): maybe this can be helpful for someone else, since there isn't any guide around (or at least I haven't found any).
By the way, ignoring the mistakes, the free dlc for the eu version of the game is crap if comparated to the japanese one:
we have Jabu of Unicorn (wow! -_-'), but on the Jap Store the free one is Libra Dokhu.