Best financial or investing board games?

I'd like to use family gatherings as opportunities to stir the mental juices of siblings/kids. I figure one opportunity to do this is through board games. There are several out there -- would anybody have a high opinion of particular ones as fun learning tools?

Monopoly everyone knows, but it doesn't apply too many principles. I know the Motley Fool had a board game, and that Kiyosaki has a few out as well.

Any recs?