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That's ancient news, 2008. The end result was... I think 4 games getting to release state, and woeful sales for some of them. Combined with the Magna Mundi debacle it scared Paradox off doing it any more.
I am aware of three: For the Glory (EU2), Arsenal of Democracy (HOI2), and Darkest Hour (HOI2), none of which I have ever seen sales numbers from.

Magna Mundi (EU4) and East vs. West (HOI3) were on separate deals since they both used the newer Clausewitz engine, but both proved too complex to complete in a timely fashion. I agree that Paradox is not likely to repeat the experiment soon.
 
I am aware of three: For the Glory (EU2), Arsenal of Democracy (HOI2), and Darkest Hour (HOI2), none of which I have ever seen sales numbers from.

Magna Mundi (EU4) and East vs. West (HOI3) were on separate deals since they both used the newer Clausewitz engine, but both proved too complex to complete in a timely fashion. I agree that Paradox is not likely to repeat the experiment soon.

Also Iron Cross.