@unknownuser said:

at the bottom of the first post in this thread, there's a link to a mac version:
http://forums.sketchucation.com/viewtopic.php?f=61&t=17877

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Ok, but there are still a whole lot of us left behind because we are stuck with our fleets of powerpcs which are still unsupported. I think this is a terrible shame. I normally donate my old powerbook to my kids when I buy a new computer. SketchyPhysics might be the single most important piece of software invented since KidPix (meaning as far as parents are concerned, those who are looking for toys that will excite and develop the imagination of their kids, there are no other important software inventions), however it is far more than a kids toy. So I am forced into a moral delemna, when I do finally get it, who gets the new mac?

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