Name of the game: Left 4K Dead 2
Link: http://gamejolt.com/online/games/action/left-4k-dead-2/1006/
Do whatever hacks you think it needs but please DON'T make the enemies/zombies mindless so that...

No.
I've no idea how to hack. But I want to learn. First, I want to make sure if it's possible to do it with a Mac.

I know that Mac's aren't the perfect gaming computers. But is it possible to hack games with a Mac? If so, HOW?!