Looks like Dracohouston beat me to it. It is true that playing on Insane at Creep City yields good credits. It takes me roughly 8-10 min to complete the game and you gain 1000 credits per victory. I just rush all of the bloom spawns and get to rank 3 asap. I used to go until rank 4 to spawn the king creep but Ive found that simply rushing at rank 3 is a bit more efficient in terms of clear speed.
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