For those just starting out in these cross-promotional activities, you'll need to earn 30 Medals in Zynga Slingo in order to be eligible for your CityVille prizes. This is done by simply playing various Slingo boards, as there are five Medals available for each. Once you've earned your 30 required Medals, you can come back to your city to earn 10 free energy and three Bonus Crew that can be saved for future use.
Unfortunately, 10 energy really isn't that great of a prize, but the Bonus Crew will help you save three of your friends from being "bugged" into helping you staff a community building or home. Plus, both sets of items are free, so I suppose we really can't complain. Hopefully, we'll see better promotions launch in the few games in Zynga's catalog that have yet to receive them, and we'll make sure to let you know if that ends up being the case.
What do you think of this particular cross-promotion between Zynga Slingo and CityVille? Have you already earned your 30 Medals for another game? Sound off in the comments.