Quote Originally Posted by Unregistered View Post
...When the game started (and I eventually found out about the fourth and fifth factory slots), I thought that opening the fifth slot was too expensive, and while I'm still not even halfway to the point where I could afford to open it, I'm reconsidering it. Though I've never tried it, the odds in the shop seem too low to spend cores on compared to a permanent unlock...
Exactly my thoughts, thou i haven't got any 5* from factory yet. In a long run 5th slot looks promising. I remember how unlocking 4th slot considerably boosted production, so i'm saving my cores for now.