Crusader Kings III has sold 2 million units worldwide since launching in September 2020, according to developer Paradox.
The Swedish studio said the medieval strategy game is "one of the fastest Paradox titles to hit that landmark number."
Paradox also noted that Royal Court, the first major expansion pack for Crusader Kings III, has already topped one million sales. For context, the add-on launched on February 8, 2022, so has amassed those sales in just over a month.
"Two million is a huge milestone for us on the Crusader Kings team," said game director Alex Oltner. "It's a strong vote of confidence from the community at large, and we're overjoyed that our games can reach such a wide audience."