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yeah boris, that makes sense. I figured capacity cards sped it up by a lot for me, since helium yield increased a lot even if you progress one or two levels. for future readers, notice you'll have to reach a specific level before you can buy the upgrade to drill yellow crystal...better stock up on helium :) 

well now i have. capacity up does it. 

have u figured it out yet? i am in gas mining but can't harvest a single yellow crystal even after letting it run for days straight

yup, i figured it'd be the artsy one. thanks :) 

can anyone tell me what is mansion's second requirement and how to get it? my concern it's a gimmicky one like joy, i know i still other obvious ones to unlock ahead of me (i'm at 177 village)