Crusader Kings II

Crusader Kings II is a grand strategy game developed by Paradox Development Studio and published by Paradox Interactive, released on February 14, 2012, as a sequel to the 2004 original. It became free-to-play on October 18, 2019, contributing to Paradox's growth. The game allows players to control a medieval dynasty from 1066 to 1453, with options to play as historical figures or create new characters using the Ruler Designer DLC. Success is measured through prestige and piety points, aiming to top fictional rankings. Key mechanics include genetics and education systems affecting traits in offspring, influencing strategic marriages. While some government types like theocracies are unplayable without mods, third-party mods, including popular ones based on franchises like Game of Thrones and The Witcher, add depth to gameplay. The game received positive reviews for its deep strategy but noted a steep learning curve. By September 2014, it had sold over 1 million copies, with expansions adding 7 million units sold, making it Paradox's most successful title before Europa Universalis IV. It averaged 12,500 daily players with an average playtime of 99 hours per player.