Well, I'm running this latest release on system 10.5.6. I've had no problems with it, although obviously I can't speak to how it might behave with snow leopard. As for the game itself, it's pretty good. Certainly at least in comparison to some of the games like this that I've seen out there. I'm sure features could be added, but I do like the resizable board, the choice of playing boards, the ability go back and revisit previous moves, etc. It has a good starting point if its author wants to evolve it.