Visit the 'Scrapyard' for the first time.
Unlock 5 Miners.
Visit the 'Coal Pits' for the first time.
Unlock 1 Miner.
Clear Floor 100 of the 'Caves'.
Clear Floor 250 of the 'Caves'.
Clear Floor 1000 of the 'Caves'.
Clear Floor 500 of the 'Caves'.
Unlock 20 Miners.
Unlock 10 Miners.
Reach Max Tier on 1 Miner.
Reach Max Tier on 5 Miners.
Reach Max Tier on 20 Miners.
Reach Max Tier on 10 Miners.
Clear Floor 1000 of the 'Dragon Mountains'.
Visit the 'Dragon Mountains' for the first time.
Clear Floor 1000 of the 'Coal Pits'.
Clear Floor 1000 of the 'Scrapyard'.
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