all purpose apocalyptic upgrade system

survival in a zombie-infested world is challenging, but i have now acquired an all-purpose post-apocalyptic upgrading system. this is what? you can acquire upgrade points that you can use to upgrade anything by killing the undead and performing chores. with this, i no longer worry a lack of worldly possessions; all i have to do is keep improving. from broken firearms to plasma explosive weaponry, from peas to super zombie-killers, and from paper aircraft to f22s, anything from fruit cores to trees that live for millennia. a single individual is comparable to a whole city in this system!