Like others have said, the game consistently freezes on the first obstacle course. Ive tried uninstalling and redownloading the program and it still crashes. Dont buy it until this issue is resolved. UPDATE After the Lion update (10.7.2) the game has become stable. Im running it on an 09 MBP with 256mb of vram with the lowest settings and the game seems to lag a little in graphic intense areas and most notably around water. Even with the lag it is playable and a very enjoyable game. My only gripe is that the game has no auto save on exit which can be frustrating if you forget and lose your progress.