Quote Originally Posted by Unregistered View Post
can anyone explain girls' levels to me? suddenly i need 50 levels for the next upgrade compared to the 25 as before and it seemed to change mid-game, not sure
There is not a whole lot to explain. The upgrades are set up arbitrarily and without any specific formula - both in terms of the levels required for the next upgrade, and in terms of the multiplier they provide.

They are also different for each of the 11 positions.