My partner is always on expert mode. Still, I can beat the 6 other selectable chars piece of cake. I can *usually* beat Toad and Koopa. Boo and Shy Guy...that's another story. I was able to beat them *once.* Unfortunately, I usually lose because of my stupid partner... stupid, lousy... *Ahem* Anyhoo, the one time I beat them, I got up to Bowser and Koopa Kid. 3-3. Grr... the last two points...
Anyway, for Dungeon Duos, I recommend playing it in the Mini-Game Room with a computer partner on expert mode. I'd put the other two on easy.
Oh, and, YAY! I finally beat Domination via massager! ...About a week ago, but that's irrelevant. ^_^ Thanks for reminding me of that idea.
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Deep inside us all is a little green elf telling us to burn things.