yeah, there are two MSN games for gba and one for ps2. I'm playing "Mahou Sensei Negima! Private Lesson 2" right now. the game mechanics itself is interesting enough. using card to attack and defend.
horcrux> if you can't read japanese (just like me) you can just download its game guide (in english of course). i wonder if gamefaqs has released faqs for those games.