this game is free and in app purchase free all upgrades add ons will be free just kill earn in game money just ads. if you would like something to be added just ask ill see about adding. work in progress added drive able cars and increased world size added fuel tank to cars you need buy gas or watch vids when cars run out. added a user name that now allows one account on the device to save but reset to allow full restart. my kids are now zombie santa one wanted to be other is farmer zombie some fun adding new stuff in in glitch sense so any bugs let me know roller coaster its been lol.added real time map and a few fixes and controls menu moved map to right and added random occurring sandstorm fixed map showing up in way of button in menu now map dont show while in game menu open.