have not played in ages. bought in 2010. cannot tell what version it is. shows splash screen and then quits.
do i have an upgrade path?
yosemite on a mac pro (early 2009)
Hello! 
The Mac OS X port of GSB was created by Red Marble Games; they’re responsible for correction of all Mac-specific problems. Contact them directly via email to (remove the pound signs below) :
support ##at## redmarblegames ##dot## com
Be patient after your initial email to them; support for a five-year-old product might not exactly happen instantly. You can also help to reduce any delays by providing them with more detail about your situation than you posted here.