2PM: What if I nerfed the upgrade cost of everything based on your level 4PM: It’s still too easy… what if I nerfed the level of equipment you can buy 5PM: It’s still too easy… what if I nerfed the way your level is calculated entirely 6PM, ESTIMATED: what if I nerf everything
yes but what is normal? :P In one of my games for the majority of people normal was too easy and so on. If you can do it in your framework the best is to code an "autobattle" feature and run a thousand tests to have some statistical numbers :)