The best selling game in Sweden during 2009 is The Sims 3, which also claimed the top spot on the PC chart in the U.S. according to NPD. EA reported 3.7 million units sold by the end of their fiscal quarter ending June 30, 2009.
However combined all versions, Modern Warfare 2 managed to sell more than The Sims 3 in Sweden. It's estimated that Modern Warfare 2 exceeded sales of 400 000 copies in the Nordic during 2009, which would make it the best selling game in the Nordic.
In the U.S. the Xbox 360 version of Modern Warfare 2 accounts for nearly two thirds of the sale during 2009. Looking at Sweden the sales is much more even. The PS3 version is taking the edge with 35%, followed by the 360 version with 34%, and the PC version last at 31% of the sales.
These figures are only physical sales since we don't have access to any digital numbers, but when speaking to Steam on their visit in Sweden, they say they can see both the physical copies of Modern Warfare 2 and the digital, since the physical needs to be activated online. Steam didn't mention any numbers, but it sounded as the sales of the PC version is much higher through digital distribution. This would certainly apply to the U.S. where only 170 000 sold copies of the PC version were reported in November by NPD. But maybe the PC version with the digital sales would have the lead in Sweden as well. But we'll never know.