If you haven't played Zynga Slingo, Medals are earned by simply playing through game boards (which are a combination of slot machines and Bingo cards) and completing certain objectives within each game dealing with earning a specific number of points or completing a "full card" with all of the numbers being covered in a game. There are five Medals available to earn in each stage, so you don't have to earn all five in a certain stage (which might be a bit difficult) to actually finish this cross-promotion's requirements.
Once you earn 30 Medals, you can head back into your Hidden Chronicles game, where you'll receive 10 free Estate Cash (the game's premium currency) along with 10 free energy. While 10 energy will only let you play one scene, it's at least a free item that you didn't have to pay for (or wait for it to recharge on its own).
We'll make sure to let you know if additional Zynga Slingo cross promotions launch in other Zynga games, so stay tuned!
What do you think of this Hidden Chronicles offer? Will you play through Zynga Slingo long enough to receive the free Estate Cash? Sound off in the comments.