In the mining system, one of the quests is to unlock 24 new miners. You get 1 miner for free with each new floor, and 3 total miners per floor, so you only get to "unlock" 2 miners per floor. The maximum depth is 10, so I am stuck at 20/24 miners and CAN'T purchase any more. As things stand, it is IMPOSSIBLE to complete this quest.
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