QUOTE(Sauce XIV @ Aug 14 2007, 07:31 PM)

That makes no sense. How are Japanese FE games harder than English FE games?
They have maniac mode. Higher level enemies, Better stats?, more enemies, you fight promotes early on, you get 5 less exp per battle*, and bonus xp gain is halved*.
Example: in English FE9 there is easy, normal, and hard mode. In JPN FE9 there is normal, hard, and maniac mode. I don't know all the details but looking up the maniac mode guide for gamefaqs should give you an idea.
*for FE9, I don't know about the others.