1) open cydia
2) go to manage->sources->edit->add
3) type; sinfuliphonerepo.com
4) open the source and find; 'ifle'. install this
5) open it go to applications->zombiefarm->zombiefarm.app->market.plist.
6) this is a hard part. you will have to seek till you find something that says; xp needed or gold needed or brains needed. you wil see beneed that <integer> and then the price. you can just tap edit and adjust the price you want. TIP; do -100 and you will earn money by purchasing it