@ceradeolugia actually, this game provides the characters list, and i didn't play this game long enough & unlock all the levels, but there're probably some levels about using for you to memorize ba bi bu be bo, pa pi pu pe po, etc.
@ceradeoluia can't really tell, but hiragana seems to be used a long with kanji. Katakana is mainly used for foreign words. And for replacing the word ba in Japanese, if you're talking about hiragana & katakana then use Ha with this mark " at the top right of the word. Like this: ば バ, it's better if you continue learn at some websites or books.
 "Kana Warrior / かなウォリアー"){kind=icon}
 "Dj Sheepwolf Mixer 4"){kind=icon}