User blog comment:Kevsuc/Crystal Calculator - Manage your Crystal Engine/@comment-25889587-20150604034242/@comment-25889587-20150604165513

I'm not sure if you can make this, but it would also be good to make a treasure upgrade efficiency calculator, where it can give you which treasure should you upgrade next that provides the most crystals per day later on. Of course, at the end, we should probably upgrade everything to +9, but we can set priorities like what I did in Crystal Engine :P