Some stages have requirements of bring 1 support, or 2 healer or whatever. If you don't have those then you can't get 3 stars. Anyway, mod isn't going to guarantee you a 3 stars, it just amuses you with the amount of your damage dealt lmao
Can't remember. Only saw it a couple of times when there were popups. Most of them only need you to finish under timing (55 seconds or xxx seconds). If you try the stage again, but only bring 2 or 3 cookies with lots of AOE, usually i take ginger bread and strawberry, then you will see when you finish quick, you'll get 3 stars... At least this is on advanced map. Anyway not sure where those details. You guys play the game, i don't even play lol