It may be taking a while, but another Zynga Slingo promotion has finally launched on Facebook; this time, in CastleVille. Luckily, if you've already completed the matching promotions in FarmVille or Hidden Chronicles, you'll be ready to go for these free prizes as well, as all three promotions require the same thing: that you earn at least 30 Medals in total in Zynga Slingo.

There are a maximum of five Medals available in each of the early levels in Zynga Slingo, which combines slot machines and bingo boards. It's quite simple to earn these 30 Medals, but also rather time consuming if you don't get lucky early on. Either way, once you earn those 30 Medals in Zynga Slingo, you'll be able to go back to your Kingdom in CastleVille to receive your prizes. You'll receive 30 free energy, along with three Hypercrafts. If you're unfamiliar, a Hypercraft will allow you to speed up the crafting process of one of your buildings by an hour each.