I don't know. For any number of reasons. Maybe it's got better balanced gameplay. Maybe it's got a better score. Maybe it's better when played on a big screen. Or maybe the Wii version is no better than the PC version. I never said it was, after all. My exact words, in fact, were, "I've only played it on the Wii and it's fine. It's a lovely game." I have no idea whether the Wii version is better than the PC version. But I do know that the Wii version plays very well, which is why I love it, and why everybody else who has played it loves it and why IGN picked it as the Wii Game of the Year.