The Upgrade Offers are personalized and are generated when a small amount of Upgrade Materials are required for the Barn/Silo upgrade.
Those offers keep popping up randomly every now and then! Usually they contain the exact number of materials you need to upgrade your Barn/Silo to the next level, but there are no diamonds. Once you make the purchase, the upgrade will be performed instantly and automatically.
The number of included materials will change real-time, according to your new balance of these materials, and so will their price. Once the amount of materials you need reaches a specific threshold the offer will disappear.
If you haven’t seen this kind of offer in your game, please check to see if you have activated it by going to the Settings > Adv. Settings > Personalized Shop.
Tap the button below!