I had that happen to me too and it kind of ticked me off. Not to mention that it suprised me. I'm getting to the point where I don't want to ring the gong because more often than not it turns out to be a negative outcome and when it does do something like "Gong grants food" it doesn't give very much. I wonder if I don't ring it for a few days if that will have an effect on it does?
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I am really enjoying Plant Tycoon and can't wait for VV3 to be released!!!!