I downloaded Powder Toy on my Mac, and it works fine but the screen/window is very small and it doesn't allow me to make it any larger. Its actually almost unplayable because of the smallness of the screen.
go into simulation options, there is an option for double size (doesn't affect the playing area size, just doubles every pixel basically), and fullscreen (same thing, just on fullscreen with black around the empty edges). You should try them both, you probably want double size. Also I don't know if fullscreen works on mac
@Kaxar(View Post) Currently, making the playing area larger would mean that everything breaks, so it's the closest you can get. Macs are crazy high in resolution so using the double size option is probably your best bet.
No, I also have it on mac and when I check the box for double size it claims that my screen resolution is too small, and trying to go fullscreen crashes tpt on my 2012 macbook pro. Double size works on my 2006 iMac though. Both are running Lion