I really like the idea overall.

Serious ideas:

• games that help explain ideas like 'screening' variables, rules for propagating information up and down different branches of the network, etc.

• more advanced topics like estimating the normalization constant for a very large hypothesis space?

• more advanced gameplay mode where you have a scenario and a list of hidden and observable variables, and have to figure out what shape the network should take - you then play out the scenario with the network you made - success requires having constructed the network well!

Bad jokes:

• A character named Gibbs who runs an energy drink stand and gives out free samples.

• The Count of Monte Carlo should make an appearance.

• A face-off against agents of the evil Frequentist, hell bent on destroying all that is (probably) good and (likely to be) held dear.