20 months ago, I restarted my game. Today I am at level 17k. The goal is to reach end of game. I have read somewhere the game will become much harder approaching end of the game. Is that still the case, when will that happen and how impossible does the game become?
I am in pretty good shape when it comes to boosters (35k gold, 7k of boosters), and my consideration is when I can start to relax a little and use more gold/boosters.