It's bubble with armor for the smaller enemy's for bigger targets you use a shotgun. After that for mid boss and last boss use weapons.
The more orbs u make killing the smaller enemy's the faster ur team gets supers for the bigger enemies.
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Who used supers on bigger stuff? You super smaller enemies to create orbs which you use to nuke more ads. Rockets for the boss
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Bigger enemies (ultras) make more orbs. You super small enemies only when there is a swarm. But that's how I play you play a different way and it works for you, this works for me.
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True normally me and my pal run titans so would double bubble in high damage areas to create orbs for what other guy end with. They are pretty much in a permanent special:P