You need to upgrade each level, I think there’s about 5 levels. Click on the tower then click info and there’s a little arrow that’s the upgrade button. You need a lot of resources and money to upgrade and each stage takes a long time (I think the last stage takes 3 days)
Comment found on Sim Empire: Level 34 ! How do...
Have you tried opening agriculture for vegetable production? And don't waste your money to learn a lot of techs take it slowly and follow the instructions on the right side. The more you'll do it on your own the more you'll get bankrupt.
Comment found on Sim Empire: Greece stuck level 10 . ...