I think we've touched this topic before. I got a Magic Mouse yesterday because my Mighty Mouse has long been gummed up, and rediscovered that side-scrolling doesn't work. Vertical scrolling on the mouse is mapped to the current puzzle direction, whether across or down. What's more, Magic Mouse scrolling seems only to work down/right in Black Ink, not up/left. I don't think that was the case with the Mighty Mouse.
Black Ink 1.1.7. Mac OS 10.6.1.