? What's Zombie State?
Anyway, besides using cheat engine, you can also use a save editor to hack the values. You can't change much, but as long as one of your character's feat points is greater than 0, you can change said character's feat points. More importantly, there's inventory editing - give yourself thousands of ammo and Training Tokens and go wild, the only restriction is that you need to have one of the item in the inventory, because it's not a very good save editor due to it being overly broad.
Look up Okutno's save editor to see what I'm talking about.