I have always use a Windows computer but last year switch to a Mac because I be feed up with the freezing and nonsense that a Windows put its user through . have play the Roller Coaster Tycoon series throughout the year , I realize that I would not be able to play it anymore because I have a Mac now ... until I stumble across this product . I read some of the review and notice most user complain of freezing and other stuff , so be reluctant to buy it see that it be $ 40 . after skim through and find several reviewer state that they turn off the `` shadow '' effect and the problem cease , I decide to purchase the game . since receive it , I have have no problem whatsoever with the product . I immediately turn off the shadow and everything have work perfectly .