TOTALLY DUMB
There are stages where it’s impossible to 3 star clear without using perks. 12-9 is a prime example of that. Clear it with “100%” health? The most I could do is keep 100% health just before the final wave. In the final wave, it’s impossible not to get hit at all, because the enemies are way too tanky. I’ve looked at all the youtube guides and they all use perks, heck they can’t even keep their health at 100% at the first wave.