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The farming really changes once you get one of the "%chance for chest on hit" items. I had over 100 victories over Wooden Fun 5 without picking...
Hmm, I may not be up on the lingo. Which enemy is Wooden Fun 5? I'm only missing 2 gold stars for the level (last boss and super secret plant)...
What enemy do you farm, and what bonuses are you using? I've been farming the second to last enemy of the chapter and haven't turned up anything...