late reply, but you can upgrade it in the arcade machine. click on the HEXATAIL character in downtown I think. idk I just deleted the game lol
I'm stuck on Melissa's quest I can make a top quality cigarette even though I have a top tier mortar
well it's been a while I played this game and honestly almost forgot everything, but as far as I remember you also needed top quality plant or something like that. the green/blue capsule
