I cannot get past field J4, no matter what I try, I get overrun with so many monsters and no mana to spare. Plus, this field has only the secondary gems... the main gem I use is multiple damage. But I need more punch without having to spend lots of mana. I have to balance the amount of gems on the pylon and defense. The more on defense means the less on the pylon and the inverse is always true as well. Either way I keep shooting myself in the foot.
