Agreed and look in console. You can try to find the KP in there and look for a backtrace. Backtrace, if one exists within the KP, points to the exact problem. If you see a, "iographics.apple.com" or something to that effect in the backtrace, it is the video card.Which OS X version, probably ML 10.8.2?
It can be several things, OS related, hardware related or even the game could be the problem.
Try a less demanding game, is it still giving kernel panics?
You could try running Apple hardware test(AHT), by holding the "D" key on start up, and look if it gives any errors, maybe Graphic Card related.