Any games that teaches Japanese?

Apart from the slightly confusing "My Japanese Coach"?

The only other games that come to my mind are mostly for kanji learning (they are japanese only, so you need to at least know hiragana):- Kageyama Method - Dennou Hanpuku: Tadashii Kanji Kaki to Rikun (NDS)
- Zaidanhoujin Nippon Kanji Nouryoku Kentei Kounin: KanKen DS (I didn't try that one, but heard it requires a good japanese level)