Crusader Kings II
Crusader Kings II is a grand strategy game with RPG elements, developed by Paradox Development Studio and published by Paradox Interactive in 2012. It is the sequel to the original Crusader Kings released in 2004.
The game is a dynasty and feudalism simulator, set during the High and Late Middle Ages in Europe, north and east Africa, and western Asia. It is based on the Clausewitz 2.5 Engine, which it shares in common with Europa Universalis IV.
The launch price was $39.99/€39.99.
It was met with generally positive reviews and has attained a metascore of 82 on Metacritic.
- August 19, 2010: Crusader Kings II development is officially announced.
- October 11th, 2011: a closed beta is announced.
- February 4, 2012: a demo is released, featuring four playable characters over a 20 year span
- February 14, 2012: game is released for Microsoft Windows.
- May 24, 2012: game is released for Mac OS X.
- June 26, 2012: Sword of Islam major DLC is released.
- October 16, 2012: Legacy of Rome major DLC is released.
- January 14, 2013: game is released for Linux.
- January 15, 2013: The Republic major DLC is released.
- May 28, 2013: The Old Gods major DLC is released.
- November 18, 2013: Sons of Abraham major DLC is released.
- December 20, 2013: GamersGate version is discontinued, and users receive free Steam keys for their purchased base game and DLCs.
- March 25, 2014: Rajas of India major DLC is released
- September 18, 2014: CKII base game has sold over one million copies, and 7 million units of DLCs/expansions. 
- ?, 2014: Charlemagne major DLC is released
Development diaries are used by the Paradox developers to announce game developments to the community:
- Initial Development Diary
- Sword of Islam
- Legacy of Rome
- Sunset Invasion
- The Republic
- The Old Gods
- Sons of Abraham
- Rajas of India
Expansion model is based on a combination of:
- paying major DLCs that unlock new gameplay (new playable characters or new features)
- free major content patches that contain the updates on core mechanics and essential features used by the DLC
- paying minor DLCs that unlock musics, graphical or customization features that do not impact gameplay
According to CKII project lead, some features were cut from base game to fit in the 18 month project duration and a few ended up in either DLC or free content patch, who is basically paid by those who do buy the DLCs.
One of the lessons learnt from Sons of Abraham expansion and the dilemma between putting larger more central features in the DLC, but keeping core mechanics in the free patch is that "future expansions will either have to unlock new areas of the game or feature more noticeable (graphically or through sheer weight of content) stuff."
Being a sandbox game, CKII testing process is not trivial. Paradox has reported running nightly automated playthroughs in Observer mode, to check game balance.
After the difficult launch of patch 2.0, Paradox acknowledged an overload and complexity issue regarding QA, and decided to rely more on Steam Open Beta patches while at the same time hiring more QA and increasing size of closed beta test group.