Dwarf Fortress is a huge success story on Steam. It sold nearly 500,000 copies less than a month after it debuted on the storefront—which, for the record, happened more than 16 years after its initial standalone release—earning its two-man development team more than $7.2 million in revenue. And it's still shifting units: Dwarf Fortress co-creator Tarn Adams told us during a GDC chat that the total figure has now climbed to roughly 630,000 copies sold on Steam...
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Dwarf Fortress has now racked up 600,000 copies sold on Steam
Source: PC Gamer (opens in a new tab)